Help Please!! Delta Diamond Seal Bonnet Stuck! | Terry Love Plumbing Advice & Remodel DIY & Professional Forum

I am attempting to replace the Diamond Seal cartridge in my Delta kitchen sink faucet, but I cannot loosen the bonnet nut from the plastic base (see pic) no matter what I try. I feel as though I am missing something obvious here. I have been grabbing the base with channel locks and trying to unloosen the nut with adjustable wrench. Won't budge at all. Any suggestions would be helpful.