I run 5-7-1 in mine and it steers great. How much camber do you have on your front wheels? If you camber them in a degree or two from zero that helps, and adding more toe-in increases it as well, but you may lose a little stability down the straight away.

Correct me if im wrong but toe out helps it steer better. Also play with the caster a little bit. If it turns good into a turn but then starts pushing try taking a little bit of caster out of it. I am running 5000 in the front 7000 in the center and 2000 in the rear. I am going to try some 1500 oil in the rear to kindof loosen her up a bit!

Yeah, you're right. Late night for me last night lol