Lots of people have mentioned centering problems with the 56 series servos from Hitec. Personally, I haven't had any issues with them at all. I have the programmer & use it whenever mounting multiple servos in the same surface but as far as centering goes, that has never really been an issue for my stuff. I've had more of a problem with the mid-range Futaba digital stuff then the Hitec stuff. In the Yak, 5625's all around. You will be fine. Don't go any less though, the surface areas of the control surfaces are huge. It is gonna respond much faster then the Kankge Cap. Fly better too.