I agree with John about the hinges and the nose wheel. Try your best to seal the gap with some monokote, or sometimes clear packing tape works great too. Also try to adjust the nose wheel mechanically. Work on getting the rudder trimmed during flight first, then center the nose wheel to that trim setting. But neither are very mandatory. I fly for 3 or 4 years before anyone told me to seal the hinges.
As for the servo buzzing, I would definitely try to free up connections or control surfaces. If it is buzzing when it is trying to hold it's position, it is draining your battery rather quickly. The buzzing is however normal when the servo is in motion.
Good luck in the spring.

Ty