Yeah, tough ball of wax eh? It will come down to compromises. Whether you choose audio or video first, you can ameliorate for the one that is more compromised. If too close to ceiling, paint a darker flat color. If OTOH too close to floor, you can acoustically treat the area to help out. If unwilling to do either, then you have to figure it out yourself. The 10" you give up is significant, but sometimes it's what might be best. Another possible solution is to go 96", and simply scoot the seating further up.
Another consideration is the ideal height respective to the height of your eyes, which is about 1/6 to 1/3 of screen height to your eyes. Therefore, if your eyes are at about 36" (will be close to that with theater seating), your eyes will be level to somewhere between 8.65" to 17.31" from the bottom of the screen.