Have you been able to get the Rominator to work yet? I have one in my SE/30 as well. It's a common problem with the Rominator, not sure if it's board thickness or some other alignment issue, but very likely you'll have to play with the positioning of the thing in the rom socket. At least that's what I had to do with mine and others had to do so as well. Big Mess mentions it on his website. I thought he might have had it fixed in the newer versions since he mentions going to a thicker PCB, but maybe not.
In any case, I can 'fix' mine either by placing small strips of card board in the hold down bracket to tension the board in the socket a bit more. Alternatively a rubber band around the top of the rominator and then to the edge of the main logic board, again to put a little extra pressure on the pins in the socket. Worked for mine, could never boot without doing one or the other.