recomendations....?

Yes, definitely use the strap to fine tune the power. The setting on the kite just sets you in the proper ball park.

The kite won't backstall or fall out when you are flying in reasonable wind and moving forward on your board, unless it's tuned really really poorly. The thing is though, there is a point where going beyond "powered up" becomes just drag and starts to actually take away your kite's power. So tuning it right helps you ride more powered and jump higher.

It'll become obvious to you pretty quick, I bet.

Yeah, Dr. Bruce has the b and w. It looks awesome in the sky. Never thought b and w would look good, (sounds boring) but it's quite striking, actually.