Sorry to hear about your trouble with Harvey - it sounds familiar though.
When Alfie started all that nonsense (end of the summer) after I stopped feeling sorry for myself (!) She started getting a time out in her travel cage (not her regular cage cause she like it too much - toys etc), and I cover it over - usually no longer than 5 mins. And that was just for really bad bites that drew blood. Maybe around half a dozen timeouts and that bad biting stopped!
She gets timeouts now in her regular cage for naughty stuff, but hasn't been in the travel cage for a long time.
So the biting is abaiting, sadly the destruction is not and she's chomping us out of house and home!
Hope Harvey passes this phase sooner rather than later.
x