Another 2 things Centaur has the armor values of Cromwell and smaller target size and ostwind has lower armor values and the same size.
OK... there are 100 more things.
1. Ostwind needs same fire-rate and dps (without suppression) as OKW-base to get useful dps. [I didn't looked into the stats now, but that would increase the number of shoots befor reload-animation] Removing the ability for the 2nd-gun suppression fire. Instead give it a cool-down ability to suppress by main-gun.
2. Bofors needs same weapon as Ostwind has now. So all other FlaKs don't look like shit.
3. Centaure needs less penetration, so all other things don't look like shit.