Pete
Fuel gauge is fine, you just get a huge reserve amount of at least 100k's.

Look in the mod section to find out how to better tune your bike. This will help reduce twitchy throttle and vibrations. Also cushion drive mod will help.

Gearing down will help with high first gear and still allow a reasonable hwy speed.

Lots of possible solutions on this site for buffeting. I found repositioning by tilting the whole screen back has given the best results. I truly believe it's too upright.

Good luck, get sorted, and see you on the road.