so - two things (maybe actually 3 things)
- Back passing is usually because you have inadvertently tapped the pitch rather than the button - you can select larger buttons in settings and floating stick to help minimise the chance of that happening
- on android you need to regularly clear your cache to avoid choppy/laggy game play ... force close the app, clear the games cache, restart the device, play the game
- some android devices have screen sensitivity settings - if you are getting a lot of strange passes/movements because of mis-touches, then try adjusting your sensitivity settings