Go as heavy as your body will allow. That’s mostly what I pick up from articles on the web and on here.
From the last cut I managed, I did cut my calories a bit too drastically towards the end, but I kept my percentages around 75-80%, for lower reps.
How you gauge it is unique to your own abilities/current progress. Even if the weight feels unusually heavy for something you otherwise could hit for higher reps, I think is okay personally.
You can still add in accessory stuff but I wouldn’t add too much since you’re already in a deficit, and wouldn’t wanna burn yourself out.