Chel build stats

What build stat seems to have no effect after you tone it up or down ? 
i haven't felt difference on balance stat. I have small sniper who has close to minimum balance. And he gets off balance easily. I have a solid D- man. Who has max balance has good weight, height, and even has max strength. Still gets knocked down. I hav Power forward - weight,height in the middle + have Big rig and Unstoppable, still gets knocked down. Sometimes if i do build editing few things up or down. I dont see/feel some effect on the. Maybe speed is the only one noticeable stat. How about rest of you chel buddies ??