I think it's worth considering "irrational thought" processes here.
Cheating, in front of a camera, is a highly irrational decision. Most irrational decisions are made when a person is under high levels of stress (you'll have heard of the phrase 'a moment of madness'), and here we have a player, apparently doing fairly well now at the top table and on a stream.
This is the point where Parker makes an irrational decision: in his mind he faces public ridicule if he bumps the HWK - he looks like a noob, inexperienced and foolish. Under mental pressure he makes a crazy choice (look an idiot with a poor move, or cheat) and changes his dial.
This doesn't condone his choice, but goes some way to explaining it from a psychological point of view. We simply make bad choices when under pressure.