I seem to be having a similar issue. It's not a problem per se, but I'm always interested to know what's going on with my machines.
My R2 trigger has two main functions for me: I use it for the closed hi-hat sound in my jazz map, and I was experimenting with using it as my ride cymbal for my general-use trap set map. When I'm using it for the HH sound it works fine, no problems at all, nice and clean, volume right where I want it.
Now, when I tried to set it for use as a ride, I started having issues. I set the trigger for the same Note Number as I usually use for my ride cymbal, so it's transmitting the same note information, the same voice, everything, but the volume and the tracking aren't nearly as good as they are with my main ride pad.
I could think of two reasons why this would be the case: I'm somehow touching the pad at a different angle when it's a ride than when it's a hi-hat, or somehow the trigger cap got mis-aligned somehow. Evidence doesn't point to either one: my hand seems to be in the same place for both occasions, and I reseated the trigger cap.
As I mentioned above, this really isn't a problem for me since the primary use for that pad is working quite well, but I don't like having unknowns in my rig. Any controbutions are appreciated. Thanks!