I recently bought my first projector and have not chosen a screen. I am interested in the Flexio electric screen. I see that they come with a 1.3 gain. Is there much of a difference between 1.1 gain and 1.3 gain? I have an Epson 720 which will be about 17' from the screen and will be viewed between 13'-17'. I would like to be able to see the screen from the side of the viewing area as it is a wide finished basement with a bar area to the side of the viewing area.