With or without the issue I would always advice to use this thing during a change.... allows you to easy pull out filament. Also it happens sometimes that there's a string with blobs of plastic at the end of the filament that gets stuck in the feeder otherwise...
with regard to the length issue, did you check if your e-steps are off?
(should not be the case if you had the original 2+ firmware before you used the tinker firmware but won't hurt to check)
check in tinker firmware:
Advanced/preferences/motion settings/axis steps per mm
E should be 369 if you have a standard + machine.
Why leave tinker? It's great.
Well did you possibly get the "2go" firmware on a um2? I assume not. You can do "reset to factory settings" as those distances I believe are stored on the eeprom but note that you will lose all your "odometer" readings such as "hours printing" so write those down for posterity first.
Also note that for removing filament you can just cut power and pull it out (you might have to heat the head to 150C or hotter first).
and for inserting you can use "advanced" "insert" and then cancel when it slows down and switch to "move material" to speed things up (or again, cut power and just shove it in there - I prever "move material" aka "move" in tinker marlin).
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