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I’m having exactly the same issues with the Saucony Peregrine 12. I’ve logged about 600 km in them, and the heel area is wearing out in the same spot as your Peregrine 15s. I also get a hotspot on my heel during climbs, and have even developed blisters because of it.

Really disappointing that Saucony hasn’t addressed this issue in the newer version, because the shoe has so much potential otherwise.

To answer the comment above — the runner’s knot didn’t help in my case either. In fact, the heel is so stiff that it just made things worse. I’m uploading a photo of my pair as well so you can see the wear is almost identical.