regarding the "too much money from planets" issue, just a single colony making 500 000 a month in net (sometimes negative tho since it loses and gets harassed sometimes) is more than enough to ruin vanilla i find, so a 0.9 multiplier per EXTRA MARKET with no other changes to colonies would still essentially not touch my problem, but ofc in nex you will have things to pay for (suggestion to make invading planets for factions not pay a bounty, only COST you, since you are spending your capital to change the political landscape, should probably be an intrinsic goal instead of an instrumental goal)
also another thing, just nerfing all colony income in general (or having penalties for controlling too many markets (vanilla already has the stab penalty that is similar to the 0.9 per market thing)) only further forces the player to only colonize the best possible planets, where as reducing all uppkeep, and reducing all market share income equally could curb the excessive money without ruining 200 hazard worlds