with all the other crap turned both on and off
PB, you need to go back to electrics 101. The pitot heat circuit breaker sits between the main bus and the wiring that leads to the pitot heater. It's there to protect that wiring from melting, burning and possibly setting fire to the aircraft in case the pitot heater itself malfunctions (shorts).
Whether you have other "crap" turned on or off doesn't matter one bit. Your voltage regulator should keep the bus voltage constant regardless of the actual total load (within its design limits obviously). If the voltage remains the same, the current through the pitot heat circuit breaker also remains the same. And it's the current through the CB which eventually trips the CB, not the voltage of the bus, or the total load on the system.
Based on what you've told us, my guess is that it's not the pitot heater itself, but rather some wiring that got damaged and is now causing an intermittent short circuit. But only with the aircraft in motion.
Please do not repeatedly reset any circuit breaker.
Agree. When a CB pops, wait a few minutes, reset it once. If it pops again, leave it.
The only exception to this might be the alternator or alternator field CB. There may be specific instructions in the POH, to be applied when the alternator might have overheated.