1/8 of an inch is quite a lot even for the 8411. I have two of these on my Bandit and my last Roo and I had minmum slop. Try what Steven had written above. Also, make sure you go out on the horn at the surface. (I am assuming you have NO slop due to push rods or clevises)

the Hitec digis are very good too #5945. They are 140 oz plus and have almost no slop. I have them on my Hot spot and so far so good.