I'm trying higher travel speed now on hex inserts to see if it helps. Have to try 1 setting at a time so I don't muddy the waters too much. It's Creality PETG for this spool which could also be an older one. Other brands of white haven't done this as bad. And yeah it is seeming mainly the design, ones that are mesh or honeycombed seem worst.

I've got rolls of TPU and TPR sitting in my cabinet but I've been a bit leery about trying it out yet. It sounds like it's not the easiest to work with.