[fullmetal]

As a middle school swimmer, I often had issues hitting the touchpad hard enough to register a time, but I was also much lighter.  I would guess that the amount of force required to get each touchpad to respond might vary a bit?  I don't know their operational priniciples.  Or maybe you need a touch over a sufficient surface area...or something.  I sympathize!

[fullmetal]

As a middle school swimmer, I often had issues hitting the touchpad hard enough to register a time, but I was also much lighter.  I would guess that the amount of force required to get each touchpad to respond might vary a bit?  I don't know their operational priniciples.  Or maybe you need a touch over a sufficient surface area...or something.  I sympathize!