G'day Mike, have successfully ran 30* naturally aspirated (EFI) in my Kawasaki ZX12R (1200cc) @11500rpm, and set 4 FIM and one DLRA record in the process,, I profess to know little, and as you say, information regarding small doses is almost non existent,,
First suggestion, do not ask advice of any top fuel persons because all thay know (and want to talk about) is 95+*,,
The temperature of the mix is critical, as you would be aware temperature changes percentage,, (ambient, blower, 5mile)
You are attempting to burn/ignite two different fuels,, Below 30* Nitro dilutes the Methanol, above 30* the BTU's in Nitro take control over the Methanol, the heat energy released becomes much more pronounced with each percentage added,,
I ran your calculations against mine (long hand, not computer generated) and came up pretty close to yours,, I note that yours are based on 4.81a/f, .744 lambda, may I suggest go richer,,
Volume, you can never have enough volume, also that methanol/Nitro mix is heavy so slow down the injectors duty cycle to 40-60*(larger injectors), did I mention volume
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Dose small percentages make a difference ?, you betcha it dose