So based on this thread and stellar reviews I was eager to demo the mx83 this past weekend. I am 5'4" 160lbs, my daily driver is a 177cm Cochise, but given the mx83 has no rocker I was looking at the head high 163. At my local shop there was a 163 on sale but the only demo was a 173. So I figured I would demo that and at least get a feel for the ski. Also the Kastle website product finder came up with a 173 recommendation. Well it was full on spring skiing on Mt Hood the conditions ranged from corn in the sun to firm in the shade. First lift up I decided to take an easy run and it was good that I did. Disaster! I couldn't get the edge of the ski to bite. I tried tip initiation, different amounts of angulation, it was like the ski was going to skid out from under me. I took 4 runs on mx83 trying all sorts of adjustment, nothing worked. So I went back to the car got out my Cochises and went back up determined to find out if it was me and mx83 or me and the snow. Sure enough once on the Cochise I was able to easily get an edge and had a great time the rest of the day. So it was me and the mx83. The ski was waxed before it went out and the edged seemed sharp to the touch. I tend to ski forward shins pressuring the tongue and legs tucked back ( hard to describe). Anyway any insights would be appreciated. Guess I saved myself a grand.
I haven't skied the MX83, but own several other Kastles and the Cochise. IMO you chose the correct length. Also, I seriously doubt that the MX83 is an inferior carver to the Cochise. Which is good for a 108 mm ski, but not in the same league even as the MX88. And reviewers have been talking about what an ice skate the 83 is. So I'd think about the following issues: 1) Are you certain the tune was right? A casual finger test may not be very informative. Also, recent Kastles are set to 1/2, while all Blizzards are 1/3, including the Cochise (verified by my shop and a rep here.) So the Cochise may have simply had sharper edges.
Second, and don't take this personally, if you ski by leaning into your boots, hips back - which I used to too - you're unlikely to achieve very high edge angles. That requires early lateral movement and projection down the slope. The Cochise's flipcore seems to be fine with low edge angles IME. Which makes sense for any ski of that width; there's a lot of slarving going on. But no Kastle I've ever skied, from the RX12 through various MX's to the BMX108, really thrives on low angles. They'll tolerate them, but not shine. The feeling is actually as if the edges are dull, in fact. The BMX series, with some early rise, seems most tolerant, but they don't sing unless you get 'em over. The MX's, not even a starter, really.
So I bet it's either the tune or your style.