" The mesh windows MUST be tight!! "
I disagree, if you are to shoot through screen is tight and allows no fluctuation for the Arrow to have movement, if it is tight as the first tip of the Arrow goes through, it will throw off the backend of the Arrow, you need to have this loose, not to lose, but loose enough to allow the Arrow to ban without interference.
I have found that when the screen is tight my shots are either off the left or to the right dependent on the fluctuation in the distance I am from my shoot through screen.
When the shoot through screen is loose there is fluctuation and the Arrow hits the spot. I've taken my lessons and the experience of Brooks, from Double Bull, and they use these things more than anybody else.
Pastor Carl