You guys need to check these out... Barefoot Buttons. I recently purchased my Firehawk and have difficulty hitting the back row of buttons without accidentally pressing the first row beneath it. After a little research, I found these little guys. Incredibly and artfully manufactured. They cost about $10 each (including shipping). A total lifesaver for live performance. Will work with any 3/8" button. Excellent for Firehawk, Helix and Pod HD.
Please note that I am in no way affiliated to the company. Just a very happy customer. I had to share.
Http://www.barefootbuttons.com