Your answer is actually in the question itself – Saturn will give results of Capricorn and Moon will give results of 4H.

Rashi results will come when Capricorn becomes active, hence Saturn will be more important.
House results will come when 4H becomes active, hence Moon will be more important.
You have to blend them as both results will come at their respective time periods. One cannot be left out by choosing the other.
Also the results of houses are more permanent than the results of rashis.

This requires keen judgement (and I would say also needs self-experimentation in the initial stage). Try out remedies on yourself and see what remedy gives what result. Then increase or decrease the intensity of the remedy (by varying type of remedy, frequency, effort, etc) and see how the intensity of the result got impacted or the method of receiving the result changed.

Some points worthy to be considered:
1. Analyse the 9L of prashna when remedy is given – it will show whether remedy will have effect, how it will manifest, and % of result. Accordingly you may vary the intensity of the remedy to get slower or quicker results. Will also show whether remedy will work or not, and even whether remedy should be given or not.
2. See the strength with which the event is happening/getting blocked – compare this with strength of remedy being considered. Remedy has to be strong enough to counter the ‘negative’ event or support the ‘positive’ event. See the praan dasha etc in which remedy is being received by client – this will also help in understanding whether remedy will work or not. Client cannot even get the remedy if the dashas don’t support in getting the remedy 🙂
3. Certain things cannot be remedied at all, so doing remedies is of no use. Death is no. 1 on this list.
4. Suitability of the remedy is a very big factor. Both space and time aspects should be combined. Often this becomes the main obstruction. Also the type of remedy should be suitable to the client – as multiple remedies can be there to achieve the same result.
5. The bhav and faith of the astrologer and the client also do play a role.
6. Remedies cannot ‘create’ an event that is denied in a chart or cannot ‘erase’ an event that is promised in the chart. So they have a range in which they can operate hence the expectation from the remedy should also be realistic.
7. Sometimes the remedy works by planting a seed of something big, and not by showing the big result immediately. This also should be considered but often this can only be realised by the client later.
8. Sometimes people do a remedy, but also do karma which keeps negating the remedy – eg reading Durga saptashati every day but exploiting females every night – the remedy will surely not work and no remedy will work. In fact many a times the current karma (kriyaman) is sufficient to block any remedy, so first the present karma has to be rectified and only after that a remedy can start showing some result.

In addition to remedies suggested by others, he has to be very careful in the upcoming Rahu-Mars dasha….. regarding all matters from health to legal matters and marriage……. Please perform Rahu-Kuja sandhi puja and havan 40 days before the dasha starts, and then Rahu-Guru sandhi puja at least 6 months before Jupiter mahadasha starts.
Starting from few days prior to Rahu-Mars dasha, till the completion of the dasha –

1. If your husband can donate blood regularly (every 2-3 weeks etc) it will be the best remedy. If not possible then let him donate digital thermometers in remote hospitals, or money for cremation of unknown bodies.
2. Worship Maa Kali in the form in which she has kept one foot on top of Shivji by visiting her temple every Tuesday or Saturday, meditating on her form, recite her chalisa. Such devi temples also do homa every purnima or amavasya. He should give some contribution for that homa and should give dry coconut, or red chilli (if being used in the homa), kumkum, etc.

3. Eat curd everyday or drink tender coconut water every 1-2 days.
4. Really avoid arguments, violence, confrontations, and hasty decisions……

The overall picture cannot be judged by this. Basically this shows that the boy and girl have very different energies. It shows some fights and disagreements because of difference in mentality / character / personality. Person from whose lagna the partner’s lagna is 6th sees it like a challenge, fight, competition, etc. But person from whose lagna the partner’s lagna is 8th sees it like an unknown fear, punishment or totally wants to avoid it. Again it depends on other combinations. This is also why in traditional teaching it used to be taught that if girl’s lagna is 8th from the boy’s lagna, it is not as bad as the boy’s lagna being 8th from girl’s lagna because society was such that girls were more tolerant and patient (and girls were like girls even mentally and emotionally not just physically, same with boys). Further you have to internet the energy.
Example: Gemini is non-serious, childlike, lacking experience, wants to explore, easygoing, wants fun and enjoyment, less mature, etc. But Capricorn is very serious, practical, disinterested, already has seen many good and bad phases of life, more mature, etc.

Now this 6-8 lagna if belonging to the same planet (Mars or Venus) is less of a trouble.

However depending on other combinations – it may manifest like boy and girl feel they are opposites and fight, or they feel they complete the missing things in each other. So don’t judge it on one aspect alone.