Update: I have gotten into touch both with the seller and Motenergy. They don't see a problem in the video so I suppose everything is in order after all. Motor heating might also be within limits. Maybe.
The good news is that my new progressive front springs from Hagon arrived early! I wasn't really expecting them in weeks since they are made to order for this somewhat rare bike. I knew there was a package coming, but I assumed it would be the LED lights for the bike I ordered from dealextreme.com.
Good looking springs with proper installation instructions included. Hopefully they will also solve my problems with the front fork and it will finally become as nice to ride as it should be.