Your loud start may just be due to a cold start which is normal. No vibrations at idle or though the steering wheel. It's more of a slight rocking side to side feeling for a brief second when firing up the engine at cold start. But it's only happened occasionally. You can definitely feel it coming from the engine and see the rpms move up and down slightly. Not sure if it's a serious issue or not.
Having to always turn off the A/C every time I start it up is more annoying honestly.