HI-Tec 5955 question

A couple quick questions about a new Hi-Tec 5955 coming form a new guy in the fun. I have basically a stock E-Maxx. I just placed the new servo which is working great. My questions are:
1) It makes a high pitch noises when turning, it does not do it when in a neutral position. Is that normal?
2) The chassis flexes a bit when it turns. Is that a sign of it not being aligned?
3) The length between the servo screw holes are about 1-2 mm shorter then the ones on the chassis. It still mounts on there. Will that cause any problems in the future?

Thanks for all the help! I have ordered the BK 12020, Strobe slipper and am waiting on the Wanderer 8XL to get in. Proline shocks and MIP diffs are installed. I am having a lot of fun doing it and I appreciate all the direction you all are giving a new guy.