Nitro = Speed
I should have been more clear in my original post, its more complicated than just doubling or tripling nitro content.
One of the things I enjoy about this hobby is tinkering with engines to increase their performance, like 2000 rpm increases from raising exhaust ports. All the little things add up in the end.
I'm going to try the first test tomorrow. I have a Thunder Tigre Pro 40 w/ a Macs pipe and header. I'll try some 15% and 25% fuel with no other changes except needle adjustments and tach both.