I like what you accomplished in that mod. I've got 6 factions plus myself trading now. Of course I started first so I have a big treasury edge on the AI. I going to try adding a little to the ship figures for the AI. I also gave the higher shipyard and trade figures to rebels. Livonia builds ships and they are the Pirates of the Baltic. No trading, just attack anyone. Cool.
I also jacked the build numbers 100 for all the + happiness buildings. It really quiets down revolts for the AI. I'm only up to about 1270, and I only see revolutions in the provinces with a revolt factor higher than 0. (Probably try taking several provinces to 1 next time around).
I also changed the prerequsite for chapter house to castle 9. It got rid of those weak assed crusades and allows a lot more trade by eliminating those wars with the best trading areas.
There is definately a lot more money in the game and the AI seems to play a lot smarter with money.
By the way, I used my base mod and added your build factors. It is similar to yours (still has the land bridges), but I have more trade goods than yours: in fact all inland provinces have either 2 or 3 trade goods. This made Poland and HRE much tougher than usual.