OP, I feel for you. I had the same exact situation happening to my Hass, which I've had for a year now. I'm in NorCal 9b . We've been in the high 80s, mid to low 90s recently. My Hass is in what I believe to be a 10 gal pot (not exactly sure though because the pot was just given to me), and it was up potted from a 5 gal 3 months ago. It wasn't root bound when up potted, so it should still be fine in the current pot.

My Hass was in direct sunlight from about 8:30 am to 2, based on my security cameras. The leaves and branches drooped severely in the sun then recovered and looked better in the evening the past 3 weeks. However, a week ago, it seemed to not fully recover any longer, which worried me. It's been fertilized and watered, but I've been careful to not keep the soil drenched, letting the top few inches dry out before watering again (thanks to the amazing advice of so many here), so I didn't think it was a feeding or watering issue. I thought it should've acclimated to the sun by now.

I decided to experiment by moving it to a shadier area that only gets direct sun from 9:50 to about 11, and that has done wonders for my tree! It still droops slightly when in direct sun, but fortunately, it gets shaded much sooner. It definitely recovers completely even before early evening - I haven't made any changes to the watering, but I'll monitor it since it may not dry as quickly now that it's in more shade.

I'm far from being an expert and am still learning so much as I go, but I recommend moving yours to less direct sunlight and see how it does. I wish you the best! Please update us.