Don, Don't forget Titan runs over 60psi on a stock head to make the power they make with a 94mm.
Another good example are pulling tractors. Lots of them still run a stock diesel head but converted to alky. 60-70psi of boost is very common for them.
The reason your combo can exceed the normal hp range of a head with 210 intake flow is because of the bp ratio and alky. I thought that was the whole reason you chose the large turbo was to minimize backpressure. I'm sure Kenny was thinking of an ordinary combo when he stated 1200hp was it for the M&A head. I'm willing to bet he wasn't thinking of an engine on alky with less than 1:1 bp ratio when he made that statement. I think you have plenty of room to raise the boost. Turn the computer off and get to the track