car pulls hard to the left in the 1/4

[Quicksilver_s13]

so i just got home from the drag strip...and i'm in a bit of a dilemma. everytime i got the car into 3rd gear and started boosting it would pull hard to the left. first time almost crossed the line, second time almost went to the wall. i've only ran once on drag radials before this and that was last season. i'm trying to figure out what the heck would cause this to happen.

here's my setup -
17x9.5 tires up front at 34psi
M/T et streets in the rear 12psi
stock silvia k diff

i made a clean pass last year and have not done anything differently except more power now. was 445hp last year and am 525hp now. my buddy runs 4in wide "skinnies" with his drag radials as it eliminates the sway you get from drag tires. now could it just be my wide front tires paired with the sway from the drag radaials that when i get going fast enough (3rd gear) they tires are grabbing the road causing me to sway and domino effect it until it pulls me hard to the left like it was doing? and would running skinny front tires eliminate the left pull?

other thought is could my stock diff be putting more power to one side than the other which is causing my car to pull hard one way?

i'm just wondering why this happened? it did the exact same thing on 2 back to back runs and just when i start boosting in 3rd gear. just looking to fix this so i can finally get into the 11's. all i need is a clean pass. input would be great thanks!!!