How to add frequency control feedback loop to a circuit for an inductive heater
I have seen this sort of stuff go poof. Keeping with what you have, you can do a PLL that measures phase angles with a phase comp and keeps the phase angle optimum for good resonance by changing the VCO frequency to the gate drive.

This should work; I did this in a previous life with a 4046 on a resonant mode PSU. Nowadays I prefer the self oscillating way because it's much more simple once you have got it going.