ok, tested
Unmount my FC from my 650 and mounted it on my Turnigy HAL project
4 RCTimer 40A Simonk flashed ESC.
4 Turnigy Aerodrive XP SK4240-750 motors
NO propellers
2 Turnigy Nanotech 4S 5000MAh 35-70C in parallel
Created a new profile on the FC using the wizard for a X quad with normal ESC's.
Connected and..................everything worked as expected, in all throttle range, from min to full.
So, you can test only one motor and ESC on the FC, disconnect the other 3 and test.
If the problem continues, then reflash the FC with the latest firmware. I know you already did it, but many people had problems with firmware, even after flashing many times.
If it doesn't solve the problem, test another ESC and motor, if you don't hav 4, don't worry, you only need one to test.
If you want to send me 1 motor and one esc to test it in my FC, no problem
If you want to send me the FC to test with my motors, no problem
If you want to send me all the quad to test it, no problem.
I don't know what else to do, and regards the NAZA fc, i'm sorry, i don't have one, so i can't help you with the testings.
Let me know your progress.
Victor.