Your Dominator can take 10PSI of fuel pressure, that's where we run our big nitrous motors. You have to confirm that fuel pressure is being maintained through the whole pass. Maybe you have but I might have missed it.
A good way to burn up a boosted motor is way too much timing. If your running 13 PSI I'd dial out at least that much timing under boost. 29, no matter what, is way too much in my opinion. Under boost the combustion process will be MUCH faster. 1.5 degress of timing taken out is not a heck of a lot.
I would assume your running decent heads if your base is 32.
Hopefully you plumbed this with -10 hose? We would normally run a bypass back to the cell from the reg versus deadhead the reg on an applicaton like this. But I think you first need to verify fuel pressure all the way down the track.