I use Gamma Supreme overgrips. If I'm playing frequently, I'll wear through the top layer and the fabric underneath will give me good traction for a while. If I play only now and then, the dirt from my hands will mix with the tacky surface and make it feel gummy. I have some Dunlop Viper overgrips on order. I wonder if I'll be able to adjust.
MuscleWeave 200G (353g 8.5 HL), Cyberflash 1.25/multi 1.35, @48/53, dropweight stringer