No my advice would be to put the screen where it views best and then if it bothers you that so much light is reflecting off the ceiling you can paint that or figure something else out. My ceiling is only 7ft2in so mine has to be so close to the ceiling and so I have the same situation, probably even worse. My plan is going to be a `1/2" foam board covered in velvet put on the ceiling above the screen, kinda arched out in the middle looking like an upside down stage.
Really that's something that you can do much later and maybe never, it's pretty far down on my list of things to do and probably should be on yours.
I have one row of seats with a bar and stools behind them, that way I have two levels of seating but no risers which really wouldn't be ideal with my low ceiling. If things feel uneasy on your second riser you might consider that as well.