actually, the basic theory is that with a better launch ie: less wheel spin you cover more distance initially with a lower speed. therefore you reach the 60' mark with a lower mph. and then that leaves you with less distance and less time to reach a top speed.
so as mentioned, less wheelspin and a good launch will actually result in lower mph.
i'd put your car on another dyno. while the numbers wont be the same, different dynos should still be close enough to show whether you're being had, cos you're mph is way off for 150kw.
to put it into perspective, a B20 powered EK over here with ~ 175hp atw (130kw) was getting trap speeds of around 106 - 107mph (ET 13.3).
anyway, back to barefoots car lol