I found out what caused your problem. Read especially underlined part.
So after this change all non-player parties make about 50% less money from loot. This was needed but now it costs you more holding clan parties because their income decreased and you need to pay their food and wages. So actually clan parties should be more useful because you pay them good money (maybe in average 0.5-1K per 100 men party for their wages + food). You cannot control them much in current state of game and you feel they are not useful enough compared to their cost. With a new feature which increases your control over your clan parties things will be better.
Still it is good if you send your save game to me. I want to examine it.
Hey sorry just woke up and I played late last night on the save, I only have 2 castles and a town now, ended up returning one of the castles so I could vote for myself and snag a town. It was MUCH better finacially once I got a town. The town literally makes more than when i had 3 castles. I will send my save however in its current state.