I run my car like that. I struggle compared to the b5m in low grip outdoor, but as the grip comes up I have the advantage. That's in mod, I would keep my car this way for stock. The biggest problem is forward bite out of slow dusty corners. I currently working on an across car shorty.
More rear weight can give more entry steering and more forward traction/less steering on exit. Moving your battery forward can remove some entry steer but will turn harder on the gas.