RE: Futaba 3305 servos
I haven't experienced any excessive slop in the 3305s. I have had problems with just about every brand of servo I have ever used, however, the S-3305s are not one of them. I'll will keep an eye on them though. I use 1" aluminum arms, plenty of throw for me, but I don't 3d. Very short and sturdy push rods, connectors and sealing hinge lines, no flutter.
IMO, the H9 27% 260 is about the finest aircraft of that type I have ever flown. A good friend has one with a Brison 2.4, HS 645s, Futaba Fasst module and it is fantastic! Good luck with your plane, might be my next.