Your Live progress has not been affected by what happens on the PTB.
Add a reward to the overheat mechanic
Penalty systems never feel good to use, and Billy's new overheat mechanic is certainly no exception, so why not add some kind of reward to players who properly manage their overheat or use Billy's saw skillfully. I have 2 ideas to do so, 1. Make it so that as the overheat meter fills billy gets some kind of buff i.e. he charges the saw faster or gains better steering. My other idea is to make it so that upon downing a survivor the blood from his victims cool his chainsaw down and immediately revert some or all of his overheat, I like the second idea more because it would keep mostly unchanged and only make it so it so snowballing is far less forgiving, but still give him the ability to do so.