Certain things helped the marriage for example don't go to bed in a provoked state especially when you can stay up all night arguing.
It was useful to both be following the same set of principles. However it wasn't Bible principles that got in the way of marriage it was the demands placed by the religion that were detrimental.
The stress of getting ready for meetings and attending when tired or ill just to keep up appearances. This gets worse for wives and children of appointed men since any absense requires a really good explanation. Other Elders seeking privileges held by others will not hold back from citing the family as bad examples in order to get what they want. This inevitably causes tension in the home. It also means that you don't actually listen to one another the husband doesn't want to hear that the wife is physically exhausted after having a hypo in the day and just needs to sleep. The wife feels the husband is an insensitive arse (I mean you Cantleave) but feels the pressure to conform.
Add to this assemblies which involved ridiculously early starts and by the time you arrived to find all the end seats were taken by elders and their families from the local congregations who covered rows of chairs with blankets. You inevitably want to snipe but couldn't just in case interested people are there and you would create a bad impression. Oh and your husband yelled at you in the car because you hadn't had time to dry your hair because you had been so busy making lunch and getting children ready. Your husband is all dressed up because he had time to care for himself and feels you are showing him up. He is very sorry about that one.
Preparation for meetings caused the most rows as he wanted to do it as a family and I wanted to be left on my own to do it. I could study a watchtower in under 10 minutes if I tried he took hours.
Weekends where you spent time appart on service all the elders together and the wife had the children. (little does he know we often sneaked off on return visits to a local coffee shop and hid there for an hour). Spending time appart kidding yourself you were spending quality time together. Being in the same room quietly seething and trying to keep children under control. Endless evenings when my husband was out attending to congregation matters sometimes clearly upset by something but unable to talk about it. This led to visits to other elders to discuss and unload issues driving a wedge between husband and wife and introducing secrets into the marriage.
The cult makes the cult the most important thing relationships are subservient to the cult.
Thank you for the opportunity to vent I enjoyed that.