The problem with electronic ign is that the duration is not long enough for Nitro/Alc. Elec ign fires a precise spark at XX deg's every single time and with gas, that is what you want, but alc/nitro makes power at different times during combustion. When the engine is cold the mix fires with the piston close to the top of the stroke with the static compression, as the engine heats up the mixture fires sooner and if you add boost to that even earlier, so with that you need a spark that covers that range for which a magneto provides. Lighting the mix early than full boost and/or heat require, you are running out of juice early on when things are not optimum to making the power. Making power in the beginning of the pass really knocks the ET down more than the gain on the top. If magnetos didn't work, they would use something else, Personaly ,would not run a mag with gasoline, that's where the electronic shows its strenght
