Sounds to me like your filament may be soft enough that the roller is compressing it (usually a sign of too much spring pressure) and it can't advance once stuck in the divot...
Filament after pull will look sortof like this pic of grinding filament, but the teethmarks from the pinion will be present in the divot as well and there will not be any filament powder/flakes from grinding. Roller side of the filament may also exhibit some deformation and appear extra-shiny.
Also, you may not have stepper current set correctly. Have you done that yet? One of the most common errors found on kits is all the steppers preset to the same VREF; the extruder VREF is usually set to a fair bit higher on direct-drive models.
The original E3 controller used 4988 drivers; they max out at 1.0A so CReality tended to drive them conservatively at ~0.73A for X/Y/Z and 0.90A for E (They derated to 75%/90%). The TMC2208s on your SKR Mini will drive up to 1.2A continuous, so you do not need to be so conservative; most of the stepper motors on these cheap printers can handle 1.5A drive current continuous duty, so your limit is still the driver, NOT the stepper motor.
Using the calculator on their website, this means the V1.0 (standalone mode) TMC2208s can be set to as high a VREF as 1.69V for 1.2A.
https://wiki.fysetc.com/TMC2208/If your mainboard supports the V1.2 2208 or 2209 drivers, this can be set in the firmware using post-codes; I haven't gotten into that process myself yet except theoretically. I'm pretty sure your MB instructions (or Monkeh, since he's back
) can explain it better than I can.
Good luck!
mnem