Hey Dude!
Hi
I think Your circuit is at CLASS B amplifier because your gates has not dc bias for GS. for feed back: do you wanna get negative feedback?
if yes , do you have voltage amplifier in preceding of your power amplifier? and what is the range of your BW?
though for having a negative feed back in this types of amplifiers , you have many simple way.
if your amplifier has voltage driver amplifier out of phase(180 degree) your feed back is very simple. you will can get feed back with a simple voltage devider and one capacitor. and if your amplifier is in phase you can use phase inverting amplifier feed back with a simple op amp or CE amp.
All the best
Goldsmith