FWIW, I gave up on the stache bars for long rides. I bought them for my Atlantis, and liked them at first, but there was no hand position where i was comfortable for more than about half an hour (mostly I ride on the tops of drop bars). I finally swapped the Mustache to my singlespeed, which mostly does short rides around town, and put some wide drop bars on the Atlantis. Solved all my problems.
Often, cushioning isn't the answer for problems like this, BTW. Have you checked your position to see if it's forcing you to put too much weight on your hands and arms? Raising your bars so they're level with the saddle or slightly higher may help, too.