I would think the manufacturer would know best, but to me, if the ignition can fire through 60 psi boost on methanol, it would seem it should be able to fire at low cylinder pressure.
Is the mag just able to cover for an overly wet/rich mixture?
Honestly never messed with anything close to your combo, but with the minimal info I have here, it seems to me that down low your mixture is to dang wet.


"use it 'till it breaks, replace as needed"