1. You are not using your estates ( you have to many unused slots - my problem is that I can not use all slots that I want to run) and they are unhappy costing money.
While this is fine for the first century or so, in OP's shoes I would actually be starting to revoke the less-necessary privileges. You want to have a lot of empty slots by the time absolutism arrives in 1610 (because every filled slot costs you 5-10 max absolutism).