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Orbiter seems to be heating TPE

I am trying to figure out why printing with TPE stops (as if jammed)

At first I thought that I had heat creep from the Revo nozzle into the heat sink and that the filament was "swelling" due to the heat before it went into the nozzle and thus jamming. So I lowered the nozzle temp down to the recommended minimum that the filament manufacturer stipulates, 220c. This went better but the jamming happened again.

I then pulled the filament out and only the realized that it was "Swelling" while still in the Orbiter extruder (v2). It then cannot exit the hole in the extruder and starts to skip/grind the filament.

The extruder's outside temp is only 34c (taken with laser temperature gun). Somehow I don't think TPE could "swell" at this heat, yet I measure thicker where the extruder is trying to push.

So, where is this problem? I have measured the filament with an vernia scale which varies between 1.74 and 1.77. So don't want to blame filament yet.

Tuffer TPU 95a prints very easily.