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Are you getting heal slip or is it just a sore spot?
Not directed at the OP, but whatever happened to breaking in boots before days of the internet and complaining about sore feet? I remember breaking in a couple pairs of White boots, and you'd always have a couple blisters in the first 2 weeks and hot spots elsewhere. After 3 weeks, they fit like a glove and gave a couple years of joy to your feet. Just seems like guys are quick to complain about any issues these days, even though boots have come a long ways in terms of support and comfort. Just say'n.....
Which model crispi? The nevadas and summits have been comfort from the word go. The thors I used this season had a similar issue, not a hot spot or rubbing but caused Achilles fatigue for lack of a better term. The rest of my foot felt good and after a week in the mountains it seemed to clear up. I did notice that lacing the top of the foot tight, and leaving the ankle a little loose, then tightening the top laces did help a bunch.