A few people have settled down experimentally to around 70water/30meth as a compromise of in-cylinder cooling and atomisation/octane booster.
Your water/fuel ratio is higher than average and you shouldn't have any cylinder distribution issues (where methanol helps) so I guess ambient temperatures would be another deciding factor for your mix. In the summer maybe a bit more meth (for the extra charge-cooling effect)
Have you ever seen any hint of detonation with your setup?
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