The spread does not matter. Makes no diff if it is a 2 spread, or a 20 spread, as long as you have the proper amount of nitrous and fuel. The tunes we give out with the kits, are "very" generic and are just a place to get started. From some of our other conversations, I know what you have....the tune I listed will be fine and very close out of the gate.13 spread with only 5psi? that what there recommendation calls.
The NOS sheet is opposite of what your saying. I've been running a super power shot with 73n 82f 5psi fuel pressure for a 175hp shot. Is this rite?.065N............052F at 5 psi will be agood place to start. As far as the new NOS sheet. Go to the NOS site, find the kit you have, open the instructions and the jet chart will be there.
I only made a few 1/8 mile passes with this jetting and it worked good. After reading all the nitrous jetting stuff here i decided to inspect the engine. It had about 250 n/a 1/4 mile passes. Its all good but the rings leaked down 35%. I'm also running a 1050 alky carb with a seperate fuel system for the nitrous using pump gas. Maybe the alky saved it?
You have one of the old tune-up sheets, which is very rich. They have re-vamped all their reccomended tune-ups, the new charts are available on-line as noted. - The new tunes will run better and make more power doing so.