If you can go as big as 110" on you're screen size I would suggest doing that, bigger is better right. A 110" screen at .8 gain at the sweet spot for the throw distance will give off 18 FL. I believe the recommended FL range at the screen is 13-17. You should be fine. You could mount the projector a little ahead of the sweet spot and gain more light out put to be a little safer if you like.
The minimum seating distance back from the screen would be 11 ft. so be aware of that as well, 10 ft. on a 100" screen.
