From my experience if it's blisters To that area it's due to your hands not being used to trials, and should cure its self with time on the bike.
If its a feeling of extreme amount of pressure on one place then I'd day position.
If I run my bars in a certain angle I get the same pain.
Also I find tennis/ squash grip tape to be better at absorbing shock. Roadie tapes a bit harder unless you spend £15