Glad to hear it is rare. The first time it happened I did clock it up to newbie error, but used bulldog clips straight after. The jam was always on the same side of the spool of grey. If It hadn’t happened to the white within minutes of loading from a freshly opened spool (so no chance to unwind before going into the load tube) I would have still said it was mishandling.
With the grey, because it was in the last third of the spool, I think you’ve hit the nail on the head with there being too much tension when winding originally, pulling filament through earlier winds. I’m monitoring the white. My dehydrator only arrived yesterday, so I haven’t had the chance to add that into the mix, but is certainly something to look out for. Thanks.