rim and tire help PLEASE

so i have searched and searched i have a 2014 rzr900 xp, not into deep mud nor rock climbing. I want 14" rims but what about the WIDTH? I have read wider tire in back makes the unit push in the corners, so what if i do widE on all 4 , can that be done or does the rzr handle better with narrower rims and tires. just very frustrated with making a choice. i like to ride very fast and hard, love the CORNERS