92 240sx vert, stripped, no sound deadening (cage going in next week), stance coilovers @ 8 of 16 clicks, 225/45/17 bfg drag radials, nismo 2 way, s13 sr made 270whp @ 9 psi(built bottom end/550's/gt28 spec R/tune/zmaf).

Best of the night:
rt.... .122
60'....1.93
330...5.556
1/8...8.551
mph..82.99

First: I got a gismo ibc from mike and it already had a 17.5 psi(putting me neer 320-330whp?) setting so Ive been running that for a couple months no prob. After I installed the bfg's and go to the track It would only boost 12-13 psi. I had 3/4 tank of gas because I went on a wimmm...
Could the extra grip load be the reason for the missing 4.5 psi? Any ideas wheres the boost? Anyone with gismo ibc knowledge wanna help me tune it in better as I would really like more boost sooner? (seems laggy for a ebc)

2nd: I broke a power steering pump at cfrc from overheating(I have a ps cooler). Tonight on my 2nd to last run I could hear the used pump on its last leg.
Could the pump cause cavitation and not flowing the fluid when I was revving to 7,500 RPM causing overheating?

Im not that big on dragracing but it was fun and its better than sitting at home. Any help, input, comments or tips are greatly appreciated.