Have you tried using 2mm silica wick for the flavor wicks? I'm wondering if there is a big difference. I'm using 2mm silica for the coils and 2mm silica for the flavor wick too.
Haven't tried 2mm for both. Especially since the existing setup is working rather well. I am tempted, however, to try some 3mm silica for a wick and fore go the flavor wick just to see what happens.