I boought a pair last year and have been having the chaffing problems with them
too.
My achilles tendon was raw in just one session. I tried loosing the bungee but
it gets worse if sand gets it the bootie. I think that sticking a neopreene
pad inside the heel part of the bootie over the seam may fix the problem, but
it still is $40 down the drain for something that was not designed right.
I will never forget to search for 2 seams on either side of the heel when
buying booties again. Another problem has been the seam where the toe split is.
The flatlock stiching gets really abrasive.
I think the best split toe booties I have used are the ones by rip curl.
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LUK4WIND & CHASE IT
PLEASE NO SPAM