To add to the pile of potential people looking for a solution, my solution basically boiled down to waiting it out with customer support as they narrow down the problem and send you a part each time.
This was 5 months in the making for me because early on I had to tear apart the PTFE feed all the way down to the toolhead or lose lengths of filament at a time so many times that I just did not want to bother with the AMS again. It ended up not mattering because feeding the filament a few times is enough to chew up the length, forcing me to cut my losses.
For the record for anyone out there, a quick fix is to let the AMS retract all the way, then turn off the power either through the powersupply or through a smart switch. DO NOT just pull out the power connector, Molex Mini connectors aren’t designed for repeated insertions, albeit the amperage the AMS draws is way below spec.
Support was gracious enough to had send me a Filament Hub twice, once with a spare motor, then finally send me an AMS mainboard.
Something about the mainboard was faulty to the point where it apparently did not correctly handle the Filament Buffer Signal, according to customer support, which is why it would just repeatedly poke the extruder and not maintain pressure and let it “bite”.
Thank you to customer support for sending me the one part that fixed the whole thing. Although I do hope the feeding process is amended so the next person doesn’t have to deal with a stubborn AMS that just leaves a meters worth of filament stuck in the entire line.
The AMS works like a charm now, fingers crossed.