Sorry - been buried on the phone and with email and not enough forum time....
Corner trapping certainly has it's advantages though normally, one would straddle the corner to extend low end efficiency. Based on your current setup, I might suggest that you simply move the existing outer panels over toward the center and put in a more standard sized panel in the corners.
Optimally, what we'd do is put something like Pillar Traps in the corners as they're going to reach a ton lower and are open on multiple sides. They can also tolerate being out of the corner a bit and still perform very well.
Bryan
