What screen for high ambient light room?

We are professional home theater designers and you have several major problems

1: JVC projectors are low lumin projectors

2: You have ambient light spill over

3: Your Grayhawk does improve contrast but is vastly inferior to ambient light blocking screens.

An ambient light reflecting screen will help as well as switching to a much higher lumen output projector you should be looking at a projector with 2500-3,000 lumins, most of the JVC projectors are 1,800 lumins

There are also DIY retrofitable battery powered blinds by Lutron

Have you considered a drape you can slide accross the room's opening to stop the light spillage?

Dave and Troy
Audio Doctor NJ

Accept that with light spillage you still need an ALR screen to compensate for any light in the room.

OP please contact us we sell many brands of screens and we are sure we can find one that will be perfect for you.

Dave and Troy
Audio Doctor NJ Screen Innovations dealer