okay. some might not agree with this but here goes.

i used to get numb left hand over 50 miles. i think from pinched nerve in my back or shoulder. since then, i've done two things.

1. i've gone to the gym to work on my core and legs (situps, planks, crunches, leg press, leg extensions, squats, back extensions, the works.)

2. i don't know if these really work, but i also added the buzzkills a few weeks ago.

i did a century last saturday and i feel great. no numb. no pain. my advice: you in particular might need to have a stronger core. get in the gym twice a week. i'd give it four to six weeks to realize a difference. else, try the buzzkills to see if they help you.

hope this helps ....