Join Date: Aug 2017
Location: Virginia Beach, VA
I'm in a similar boat. I have BarkBusters, Oxford heated grips, and Lee Parks Deer Sports PCi gloves. Above 30°F it's fine, but when I get into the 20s, my thumbs start to get chilled even with the Oxfords at 100%. I think my issue is with the airflow around the guards, but I can't lower them any more without having the tops of my hands exposed to the wind.
I've tried Serius Heatwave Liners underneath (they look similar to the freezout liners), but they didn't make much difference at all. I've heard that putting a liner under a tight-fitting glove can restrict blood flow and wind up not keeping your hands warmer. That may be what we're experiencing.
I'm fairly confident it's not Raynauds because I don't have a problem when I'm not riding, and I don't get the color change that's typical with that syndrome. If you haven't ruled that out, HootStrom, it might be worth a quick google of Raynauds Syndrome.
I'm at a loss for the best next step. The DeerSports PCis are very warm for how not bulky they are, and I hesitate to spend more on more gloves since they weren't cheap and it seems like all the warmer options are bulkier. I thought about springing for a heated jacket liner next and see if keeping my core warmer helps the hands at all. I'm not sure that will help though, because like you it's just my thumbs that get cold and I think it's tied to the wind. Yarz1 might be on the right track with the DIY wind diverters. HippoHands (also not cheap), might be the simplest option.
I'm excited to see what others come up with.
2016 V-Strom 650