Hello, first time posting here. I just set up my projector (viewsonic pj1075, not bought for this purpose) and have encountered a problem. The picture is quite grainy on my screen, a Dalite Model B glass beaded 84" diagonal. From what I've found on these forums, there are two problems with glass beads: graininess and excessive refraction. That's another problem I have, the room is incredibly bright. My projector is mounted around 3 feet above and 2 feet behind the viewing area and the screen is 13 feet from the projector. I have complete control of lighting in the room. Since the screen is brand new, should I return it for a matte white? Any other suggestions. Thanks.