I think the factory tint of 35% allows in too much light for me. I was going to try to get a 25% tint all around. If they were to put 25% on the fronts and put a 25% on top of the rear would it come out to look like 25% or would it be darker. I am assuming it would be a bit darker in the rear since it is double layering tint. Anyway around this?