You must also accomodate for fuel pressure on the shots. A 40 shot of fuel at 23 psi of fuel pressure isn't enough if the shots fuel was rated for 50 psi. Same thing with bottle pressure.

I would call NX and tell them the shot you wanna run and what fuel pressure the car is at and have them tell you what jet sizes to run.

The instructions for my NOS kit had a table in it to figure out which you should run does yours have the same?