Thanks!
Okay so last question I think... I've heard when you choose to abolish the Sejm a stack of like 70k rebels spawns, which doesn't sound fun. So I have two options: either let noble rebels convert me early and then just convert to Absolute Monarchy the normal way (to both avoid that rebel stack and the Sejm), or through the abolish Sejm event.
Xara stated that the Sejm is a good thing if used correctly - so would general consensus say to stick with the Sejm until I get the event to abolish it?
In my memory they don't all spawn as a single stack, and they don't have your NI bonuses to troops, so with a decent general you'll roll over them. Polish cavalry in this game is superb, a high maneuver/shock leader with a hefty amount of cav will carry you into the 18th century. If you blob properly (assimilate the orders and lithuania) you should have no problems defeating the rebels (unless you're in a nasty war at the time)