I don't know the answer to your question, except to say that I replace the spider gasket in my multiport about once per season. I just figured mine gets more wear and tear, because my pool is open year-round, but that may or may not have anything to do with it. My thinking is that what little cold weather we get probably contributes to it drying out and cracking, but I dunno.
I, like you, have tried both with and without adhesive, and it doesn't really seem to make a difference--but for $15 gasket and a 10-minute job, I just replace it and move on.....
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