the tail goes right, or the nose points right? If the tail is going to the right, then you need more thrust out of the tail blades. Best way is to either adjust the linkage, or slide the servo down the tail if you can. If this is a Pro and has the 520 size servo, then the linkage is your only option.
It's best to keep 0 sub trim, but sometimes you need to use it to center the horn to the linkage. Once you do this, if you are using a MEMS gyro, you will have to go through the setup again and adjust your endpoints.