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I think you may have to dismantle the whole filament feed line and check for places its getting stuck, it mabe something as simple as the heat sinks on the hot end are to near the heat block, or the nozzle & ptfe liner inside the nozzle throat are making contact, there are many causes but some pictures of the printer would help.
I have had the situation where there has been a tiny barb on the ptfe liner causing it not to seat correctly.