The HS55 and the Eflite s75 aren't very good servos for cyclic. Get some of the Hitec HS-65 either MG or HB or get the JS DS285. Yes these options cost more but the gear train won't break in a minor crash and they will actually center. The replacement gears for the 65hb are only $7 if you do break them. Flying will actually be easier for you because the heli will hold a trim setting and give you consistent flights.