I was able to win the battle and move to the next step in CWO without using the console ( lol for the 1.1 issues thankfully gone) My FPS took a hit though- went as low as 30ish at some points, but I get these drops sometimes near places added with immersive settlements regardless of what's going on.
Immersive Settlements caused some pathing issues but it was minor. I haven't had any issues yet, unlike 1.1- Even with 200+ mods running with it. I used ice spells to put them out though. Somebody managed to set the outer walls of whiterun on fire during the battle.
I used Live another life to start out as a stormcloak and proceeded to the battle at whiterun.