Did you do those voltage checks? Earlier you said your coil resistance was 5Ω and you had 5A through it. That would take 25V. Did you put 25V on the MOSFET's Gate?
no the max I put was 20v, that is basic OHMS law right 25/5 = 5 amps
So that is my problem I believe, I am sharing my gate voltage with my power supply, but since it took a higher voltage going across the Mosfet to achieve 5 amps, i should probably power my gate with a separate 10v supply with a common ground, so i can not damage my MOSFET and still be able to use a higher voltage to achieve my acquired 5amp draw.
I believe that was my problem, i am right?