1250 Bandit runs fine at part throttle, but feels like it is starving for fuel at WOT. ???

Re fuel problem on 2007 1250 GSF Bandit.
Take out the fuel pump, and check cleanliness of screen.
It sounds like it is partially blocked to me. The screen is small and it does not take much to block it up with gunk. You should then have full fuel flow. You have to remove tank, and turn upside down, then remove the allen bolts and carefully work the whole assembly out. Be careful, because it will only slide out and in at a particular angle. You are supposed to replace the O ring seal, but I think this is on condtion. Clean the seal and put some sort of synthetic or rubber grease on it.

I would like to lower the seat height, the owners book states see dealer as if you require parts

Sounds like a carburetor problem. Have you recently changed air filter, exhaust set up or anything like that? If so you may need to change/ adjust jets. This is a complicated proceedure but possible if you have spare time and a bit of know-how.

If the bike sat for a while before this problem started it may have some residue left when the petrol evaporated, blocking part of the carbs. In this case they will need a thorough clean.