The 13 mm bar isn't for everyone. I tried it and it turned the sled into what I would best describe as terrible.
I installed a set of sno-trackers for my trip to the UP. The Sno-Trackers turned it into a corner carving animal. I could feel the front end roll getting a little pronounced. I installed the 13 mm bar and lost all my carving ability. The sled wanted to push, hook, push and hook. It also rode far more harshly and less forgiving. Put the stock bar back on and it was a corner carving animal again. It must need to roll a slight bit to keep the carbide and ski planted, much like the way you transfer weight with the rear skid from front to rear.
I sold mine after one day of use, really didn't like it at all.