If you went the 30PSI route, it may be advisable to do away with the rubber hoses and go to -16 braided stainless hose. I am worried about the burst pressure after a bunch of heat cycles and a few years of occasional use, as well as hoses popping off of barbs. At 200mph you probably do not want to get sprayed with superheated water, as it may provide a bit of a distraction.
By the way, you said "Old computer"... how old? The '99 computers lock the injectors open when you exceed 80% duty cycle, and all the later computers shut them down completely. Kind of nice safety net, if you have the '99 computer.
Can't wait to see you take the car down the salt- great job thus far!