Joined: Aug 2008
Posts: 13,144
Likes: 2,167
From: Ann Arbor, MI
Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada
I'd bet dollars to doughnuts this is simply a setup and technique issue, and that OP doesn't need to buy anything additional.
i'd further bet that, following Tjspiel's thought regarding lever position, that the OP is loading up fully flexed wrists.
My suggestion to the OP is to get thee to a shop with a veteran wrench who knows how to setup a bike. How do you find this out? If after explaining your problem they start offering solutions without asking you to demonstrate your grip, go somewhere else.
The other option would be for the OP to fiddle with adjustments themselves; you could post some pics here so that you can increase rhe odds of getting good guidance, but you'll still get plenty more lousy advice, too, the upside of which is that, in the end, you'll be better equipped to understand what works and why.
Bonne chance!