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@Chopsicle
Check the needle size is right for thread size - if hole in the needle is too small, it can cause this dragging.
Same for the spool of thread on the top; make sure it’s spinning freely and not snagging, and that it’s sat on a base bigger than the spool ie not just loose on a spindle. Sometimes the jerky nature of domestics means a loop of thread ‘drops off’ the spool and catches on the spindle, causing irregular tension. I improved a feed by cutting a circle of fleece cloth to sit under the spool of thread, meaning it rolled consistent and steady, and didn’t jerk forward and fire lots of thread downstream - more apparent a high speed like you have.
Although it’s been serviced, double- check that the underside mechanism is entirely free from stray thread and residue - anything that impedes the looper could cause the inconsistent stitching. Pair of tweezers, and a long needle or cocktail stick to have a poke about.