My guess is that it is done fermenting or close to it. 2 packs of dry yeast is a lot and 75 degrees is on the warm side..... so, I am thinking the yeast ripped through it.
I would doubt that the yeast dropped out or that you would need to add more yeast.
Add dry hops as you planned.
The biggest concern will be that the temps hit the high side of what you want and could result in some stronger esters or possibly some off flavors from fermenting a touch hot.
Ideally, you keep the temps down closer to the 68-70 range. But, I don't know that it got warm enough to "ruin" anything. Just have to wait and see.
Room temperature was ideal at 18C but fermantation went too vigorous that it jumped to 24C. My expected fg was 1.019 or 1.020, I got 1.024 yesterday and dropped my second dry hop charge. Planning to cold crash for a few days and bottle it wednesday.