That will be one slow, flying pig. Even with the clearance you have 1045s will work. You should try some just for the hell of it, you may like...
You should be pleased.
Try the top ground to the top middle pin and work your pitch pot, look for any voltage changes. Also try it (same ground) to the bottom middle...
Are all the voltages you listed using the common ground on the right for all the various pins? Have you tried to power up the gimbal using 12V...
Best to have wind at your face when learning.
Maybe make it a hair bigger so you can try some ~1045 props. Those motors can handle it and you'll probably get at least 10% more thrust while...
What are you using now? How many axis was it?
This guy likes it.
FWIW it's best to NOT store a fully charged battery.
Why not, may as well learn the basics. For some of us it's about the joy of flying. It's nice to have a toy or two when you just wanna step out...
That's pretty common if you are using PWM, it's not a big deal.
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