Hey Matt.
Good to see you there the other night.
The 60ft times are definitely the thing slowing you down at the moment.
Every .1 of a sec you cut off the 60ft time SHOULD double at the end of the run, e.g. shave off a tenth will get you 2 tenths off your ET.
Go for the LSD and try to get some better tyres for the strip. Either go hard out and get some DOT rated drag slicks, or go for some used circuit racing tyres if you can find some. They're good as, I used them on my car when I took it to the drags. Let the pressures down too, it'll also help with the launch.
The trap speed is generally an indication of how much power you have (not if you're going to wheel spin half the way though). Did you notice an improvement when you took the front bumper off? It should have helped out a bit to cool ya intercooler and thus give you a bit more indicated boost and power.
Your reaction time will come into it if you wanted to get into DYO racing. It doesn't affect your ET, but can determine if you win or not.
In an extreme case: Two cars of identical ETs with one having a reaction of .2 sec and the other having a poo reaction of say 2.2 seconds, the first guy would cross the line 2 seconds earlier an take the win.
I can't wait to get back and have another go at the drags.
Good fun