Servo issue Ace 1313
 

I just picked up Ace 1313 servo for a slash that I'm building and when I try to use it with my Futaba 3pk system I just can't get it to stay straight. I've installed the servo horn over and over and still nothing. So I started moving my alignment and it stays straight for a bit than just hangs a right. I've heard of some servos not getting along with some receivers but not sure if this is a combo thats affected. Running 2.4ghz Futaba 3pk and r603fs surface receiver. Anybody else had this issue with this servo?