your 60ft times are not as bad as you think concidering a 5 sp and NA rearend. I think your lack of mph has to do with heatsoak + the fact that you are mostlikely spinning thru 1st gear and shifting slower than u could.
Its not easy to drive a 500 whp car but i'd suggest throwing on some mt's on 15 inch rims and cutting those 60 ft times down to 1.7 1.8. If you don't spin thru 1st you will see higher traps.