im not like a suspension guy expert lol, but in my seat of the pants experience lol but the rear does seem to handle well, i have taken some corners much faster with confidence and with turning.
as far as the spacers i have had no issues with the AWD system, no issues known to me as far as handling, i actually autocrossed with the spacers on,currently on 225/40 i like the wider stance , i do have a set of 235/40 though, but as far as i know probably wouldnt use spacers for track use lol