If you haven't had an alignment to max out the front camber, you definitely need to do that. However, camber alone won't fix this problem as you've literally melted the tread across the entire surface of the tire and you're chunking everywhere, not just on the outsides.
I've seen several people destroy nearly new sets of PZeroes and Michelin PS4's on the track once they get to a high intermediate level of HPDE. Once you're at this level, you probably need to look toward a more track-focused tire option. Many street tires just don't handle the heat well, and cars with 20" rims seem much more susceptible to tire damage due to overheating. (The case's I've seen have been almost exclusively 20" rims).
A few suggestions:
I'd recommend getting some 18" or 19" rims and going with a more track-friendly tire like a Nitto NT-01, Bridgestone RE-71R's eventual replacement, Continental Extreme Contact Force, Advan A052, Hankook RS4's, etc. My personal preference is the Nitto's on 18" rims, but everyone has their own opinion and there is a lot of discussion on the forum.
I went the same way as
@bigmoguls and got some 987.1 18" rims for $600 off eBay and I swap out my wheels and brake pads when I go to the track.
If you're eating tires like this, you're going to start eating brake pads as well. There is a huge performance and longevity jump going to dedicated track pads, but you really need to swap them between events as they squeal like crazy on the street.
If you're going to be DE'ing a lot, get studs from Tarett for the front calipers to avoid stripping the uprights from frequent pad changes.
You can see a number of articles on track pads and Tarett studs on previous posts in the forum.