Seriously heavy overextrusion  

Seriously heavy overextrusion

I've had my MK3 kit for about a month now and had very little problems with it. 2 days ago, however, my PC crashed, deleting all my presets for S3D. At the same time, I seem to be running into a lot of problems with the MK3.
With prusa PLA on .1mm detail, 215/60 and standard settings from Josef's .fff, I run into problems I've never seen before (also not on my other printer, CR10).
It starts with the pressure line right after bed levelling; as it's laying down the last 3cm, I hear the bondtech gears violently clicking/twitching and the line of filament turns into a flew blobs. Never had this before, it also does this on gcode I sliced a week ago.

Then, the first layer goes down pretty uneventful. I've had some problems with getting prints to stick the last two days but it feels that the live z I got now works pretty OK. Once the first layer is done, the real problems start.

A few times every layer I hear the gears slip/click. The print looks terrible, the infill looks 3x as thick as it should/used to. I can see the whole extruder assembly vibrate and bounce over the rough surface of the print.
After aborting, the bottom layer looks fine but I can see on the side of the print there are a lot of zits/artifacts.
Anyone any idea what is suddenly going on?

I haven't done anything to the printer, except upgrading the firmware to 3.2RC and back to 3.1.3 after I didn't get the first layer to stick on the RC build either. It's not the filament, it does this with all rolls and they are stored dry.
Any ideas are appreciated!