That change to the heat shield must be very recent. The original pipes from my '08 leave the clamps exposed. Sorry, can't help with the AI removal, but I do seem to remember a post here discussing an issue regarding the EFI models. Or maybe it's just the CATs in the pipes, they get clogged if AI is removed. I'm sure someone more knowledgeable on this will comment.
I have two sets of earlier pipes now for my bike. One has only the first two baffles removed, and those are great for longer distances where I would want a less obnixious volume level. They still produce that low rumble at idle. The other set is completely gutted except for the reducer cone at the input and a set of small 4" baffles that I installed. Those are what I use everyday for back and forth to work and short trips. The sound is terrific, much better than the TORs I used previously. Considering the holes you added in the last plate, I suspect your pipes sound about like that.
