I would actually do a smaller deficit for a month and see how you fare. 20% is a bit big on such a weight heavy program. Also if you're not hitting enough protein often enough that can stall you out a bit.

Sorry you're having a rough patch.

Unfortunately I bought into the "reset your metabolism" hype and started eating at maintenance several weeks ago, but stopped after about 3 weeks because a) I felt bloated/sick, b) I noticed myself falling back into old habits, and c) I reviewed 370 days of my food diary(!) to see my calorie intake during that time, and I only ate 1200 cals on 21 days. So I decided to stop the madness and reduce cals again. As for protein, I've had my macros set to 40/30/30 and I focus on hitting the protein macro, because it seems impossible (at least in my case) to achieve the perfect 40/30/30.