Steering not equal

[westyguesty]

I'm not sure if this should be in the schumacher part or if it's a general problem.
Just getting back into racing and I have a problem setting the steering on my cougar. I can put the servo horn on the servo and then need either right or left trim depending which spline it's on, to get it to go straight, no problem there. The problem i have is I can either get full left or right lock, but not both. I didn't think it was too much of a problem, until I tried the car on a slippy track and had to turn the dual rate down on the transmitter, and it's very noticable then, having to slow down alot more turning one way.

It's probably something obvious i'm doing but I have either forgot how to fix it, or never had the problem before.

Any ideas ?