Since you outer screens are smaller, have you taken into account that you will need to size the mixes for them to a size larger than your output. Remember that 3 mixes on a TH2G think their the same size. You have to scale the smaller projectors to a larger size in order to proportionately match them to the larger center. For example, if the ctr pj is twice the size as the sides, then you will zoom the sides to double size effectively cropping the top and bottom quarters of the image on these. If you start with a hatch grid on the projectors, you'll see what I mean. Just scale until the hatch grid matches.