maybe it is more of a helmet issue and where the sweat drips? I have had that problem. The Bell Zepher has a sweat guide – it channels sweat in front of glasses. i turned to a POC Octal and it helped me - tends to drop sweat on the sides or in front of glasses. I shave my head and sweat a lot too.
I use the POC Do flow I think - the one with a separate lens for each eye. Works well.