Body Geometry
If the PIs don't work out, try Specialized Body Geometry gloves. They solved most of my numbness/tingling issues. Not cheap, but lots of padding right where you need it (where most of the nerves of the hand are most affected by cycling), and not a lot of extra padding where it isn't needed.
Only glitch is that I haven't been able to find them anywhere other than Specialized website, so there's no opportunity for comparison shopping. I'm sure SOMEONE else must sell them, though.
"Do I contradict myself? Very well, then, I contradict myself." --Walt Whitman