You live not far from me in NoVA, and we go through some pretty drastic heat/cold cycles. I store my bikes indoors, but if you use a garage or space not climat comtrolled, you could be stretching and relaxing the tape each cycle, degrading the adjesive and resulting in a slightly relaxed tape tension. Also possible that since this was the first set of wheels you used Kapton on, your K-Fu was deficient and the tape was not wrapped tightly enough.

If that wheelset is using spokes 2mm too long (how much pokes up above the nipple?), you might want to consider disassembly, shortening the spokes, and reassembling.

Or, like you said, maybe it’s just you. Probably not, but hey, you brought it up!