I too found that the servos were not exactly level either. I tried to pull off the throws and level them, however that wasn't possible. But I was still able to level the swashplate and still have 1/2" room at the top of the mainshaft for the head. But you need to be careful. You can damage the servo if not. Hope you find your 'happy place' and are able to get the servos and swashplate adjusted right. the main thing is to ensure that the swashplate is level and you have the main blades and head set properly.

Good Luck, and happy flying...