Since nobody else is answering, I will offer my feeble suggestions.
First, what version(s) of Traps do you have?
I have Real Traps, too - 2 each of 3 different versions (2 standard Mini's, 2 Micro HF's and 2 Mini LE's). Remember that the HF's are designed to affect MUCH more then just bass frequencies. The LE's are designed for 'Home Theater' installations, I guess due to their size and shape.
I was getting a weird result when using the LE's at the first reflection points, with each LE standing upright parallel to the side walls. This combination seemed to 'suck' the right-to-left balance towards one side, almost like the right speaker's tweeter was partially blown or wired out-of-phase.
Given that my room is not symetrical, the Speaker-to-Trap distances are unavoidably different, so I thought this was just a room issue. But, I replaced the right Mini LE with a full-thickness, standard Mini, and the problem dissappeared.
I guess my point is, you may want to experiment with moving different versions of Traps into the locations that you found to be the most effective positions - such as replacing an HF model with a standard Mini, or even use a Micro, etc. The improvement in my situation was immediately apparent.
Beyond that, I would HIGHLY recommend talking to the guys at Real Traps before attaching wood to the front of the traps. It may totally negate their sonic value, and could even damage or discolor them physically.
Hope that helps, and Good Luck with your experimentation...
.