I can't say much about the bit attached to the fin itself, but as for the bungees... I put bungees on my quattros 2 years ago, and they've started to crack, are sticky, and basically as you describe, granted it was 2 years before it happened but, they were fine, then all of a sudden they weren't. I'm waiting for them to snap (i checked mine when a colleague had his sticky bungees snap). Somebody at the LDS called Mares, and apparently the response was effectively "we've never heard of that, it must be your fault" despite Mares advertising the bungees as being resistant to pretty much everything.