I have 14 8711 servos with slop. All out of a 40% Extra. This is common amongst IMAC/3D flyers. I have well over 200 flights with my old SM Viper with no slop in the 8711s. Slop with JR is not an issue with jets. Also have a Ultra Flash with 8411 with 100 flights and no slop. I use Hitec 7955 in my SM f-4 and Hitec 7950s in my old FB F-16, again with no issues. We're talking about scale jets here, not ultra precision airplanes, so the brand of servo doesn't matter.