What calories and macros are you running?
What was your maintenance calorie level at the start of the cut?
Any particular reason you're doing sumo instead of regs?
Alright, I don't know your exact maintenance but I think you can be around 2200 calories a while. When I was 175 at 6'3, my maintenance was 2800. IIRC you're a bit shorter with roughly the same muscle mass so you're maintenance should be lower than mine. 2200-2300 is about 500 calorie deficit or slightly more if so, and thats not a huge deficit. Anyway, I don't think you should go down to 2000 or below.
Nice with the sumo DLs, btw.
Just make sure you don't round your lower back at the start. I'm very strong off the floor with a rounded back sumo (can easily pull my conventional 1RM for reps) but it puts too much stress on the back. Sumos are tricky in that way since they can feel right when your form is terrible. You won't notice until you see it on film. Its a technically much harder lift than conventional DLs. Just a word of caution.
I can chime in with my view:
People with shorter limbs and/or longer torso will be in a better pulling position with sumo.
Sumo also puts less strain on the low back as the torso is more vertical and you use more quad strength than lower back in comparison to a conventional deadlift. Same thing as front squats versus back squats.
For those reasons, sumo tends to work better than conventionals if you have lower back problems.