Picked up some marine grade epoxy type stuff today at lowes. I'm going to keep it on the side just in case. Hopefully uniseals come in today.
Called current culture today to speak to them about their experience with uni seals and see if they had any suggestions and if the curved surface round buckets was my issue. TOTAL CRAP CUSTOMER SERVICE! I told them up front right off the bat that I was using round buckets as opposed to theirs and asked them in a way to indicate I might be willing to purchase their buckets instead. The customer service rep basically gave me dick for information and was totally reluctant to discuss. Nothing more than "we sell thousands of our systems and buckets and rarely ever have an issue".
Afterwards, I called the manufacturer of the uniseals and was treated with respect, and a total willingness to listen and ask questions to help me as well as make suggestions.
They basically stated the curved surface of round buckets has nothing to do with them leaking because that's what they are made to work with, curved surfaces.
So, for future reference, I highly suggest to anyone thinking about it, avoid CC like the plague. Build your own system.
I'm speculating now, but the only thing I can come up with is either the bucket hole is not perfectly round (hole saw wobble possibly) or the pvc is going in at a bad angle thereby tweaking the uniseal to some degree, or a combination of both.
I'm going to be super careful, make perfect holes, deburr them well, and install new seals in new buckets and change out the culprit bucket tonight or tomorrow when the seals arrive. I am pretty sure it's just one bucket leaking and I have 2 spare seals. But just in case I think I'd rather wait till I have the new ones on hand. I'll do this w/o any added sealers/epoxy. Adding epoxy only if they leak again after the fix. After all, I have 3 (and I think the 4th) buckets not leaking at all.