75 shot should be fine. That's the most I'd run single fogger on a 4 cyl, go direct port for 100+. I wouldn't run more than 100 on a 4 cyl in the first place, though.

75 dry... how will your kit be adding fuel? Pushing extra fuel pressure? I'm not sure I trust that method all the way to a 75 shot but I'm no nitrous expert. Maybe set the base timing back 2-3 degrees and take a chance with it.

New TL has 270hp, doesn't it? Runs low 14's?