You have a damaged feed path somehow. There is a PTFE tube in there that's supposed to help guide the filament and it is damaged. If you can't do a cold pull n

You have a damaged feed path somehow. There is a PTFE tube in there that's supposed to help guide the filament and it is damaged. If you can't do a cold pull nothing will work because the shape of the filament will change inside the feed path and it will bind up. Some hot ends do not have the PTFE tube, but they have metal parts that must be mated together precisely in order for the polymer to flow through. If there are gaps the polymer flows into those forms little nuggets and it can't work. If I were you I would replace your hot end, and make sure your feed path is factory spec all the way through and try again. Clean the feeder gears, make sure you got nice Boden tube on there, the whole thing. Pet polymers take on water very slowly. And many plas will work whether they're wet or dry. I do not believe that's your problem. If you've got super aggressive Snap Crackle Pop when purging some material through maybe. But I would look elsewhere first. If I were you, I would also get a known setup that just prints a 1-in cube. And work that until it's perfect. The Telltale here is the curling up around the nozzle and the clogging. Your machine can't sustain a flow rate. Once the filament is moving it's okay but once it stops part of it is solidifying in there and preventing movement from then on. Once you get it all working, if you have replaced your hot end, you can then compare that one to the one you have now and probably fix it.