hi guys
i have my gy401 setup on my hornet cp and have some trouble with tail drifting and waging

it seems to want to wagg then it will stop and drift then i return the tail to tail in and it will wag after the input

i looks like the servo arm dose not stop pulsing back and forth while in flight ,the servo horn mover a total of 3mm while pulsing

whitch is the gain controll out of the screws i cant work this gyro out due to the fact im still a beginner after 16 months
man we need a club here in launceston
i fly quite well on realflight sim i would say it is an easy sim but i still lack the setup knowledge and the ability to spot the problems and know what to change