If you can fly that on the sim.. that would be a nice trainer plane.  As far as the battery throwing off the CG or center of gravity, it depends where the battery is located.  I'm assuming in this model it could be  or just front of the CG based on the motor location.  Going from 1800 to 2200 will make a bit of difference but more likely in the compartment area. A 2200 just may not fit.

Just read the comments, Nick on Sept 6 says he's flying 2200 mah and getting 40 mins on 1/4 to 1/2 throtte so you should be good. Doesn;'t say if he had to modify the battery compartment or not.   He says there's 30g of weight in the nose (roughly 1 oucne). so you could remove some that (if you can get to it) when you put the larger battery in.

Everyone rates it highly... i say go for it.