You mentioned about 'For Diwsabhava lagna, 6th lord having a link/aspect with Jupiter can give post marital issues'. Can you explain the reason behind this. It will help understand it better. And how to observe and understand these kind of tidbits?
For Dwiswabhava 7th lord is bhadaka so connection with 6th will reduce the negative effects of it. But at female horoscope you also need to observe the 9th house about marital life. But we need to consider all other . This is only basic statement.