GM is short for goodmorning.
Dormant hip, meaning what exactly? Do you mean weak glutes?
Your muscles won't be "dormant." They might be weak, tight, or injured though. I still say just push your numbers for a while before you start worrying about stuff like this, but if you can post a video, we can probably help you figure out where your form is off and where your weak links are.
For comparison's sake though, I squat 605 raw and can do glute bridges with 455 for reps, although I haven't seen much benefit from them.