i think i finally found and solved the problem.
After i ordered again nearly every sensor just for triple check everything, the car starts up and runs great after i hooked up the now 3rd new MAF.
So it seems like the other two MAF Sensors failed directly from the beginning.
the funniest thing is that nothing changed in the way it idles when i pulled the plug from the MAF but with the new MAF it runs now WAY SMOOTHER and in all temperatures without stalling or such things.
I'm so glad that this is finally solved and now i could give all the other unused sensors back and have a nice day and week
Thanks for everything
PS: i hope i have the 2nd Bonneville also finished soon, then i will post up a few pics of my Rides.