I'm currently at your log file, thanks!
If you are only using the Pixracer mag you might not be able to get decent performance. The interferences in the center of the frame are typically significant and you want the GPS including a mag to be on a mast for good performance.
The velocity is set by VEL CRUISE. Max is just the upper limit. I have not seen another report on the safety switch and can't reproduce. I've updated the param meta data to clearly state that the Geofence option is "Return to Land" and I've removed the flight termination option from the drop-down since its a pro feature.