I'm new to touring and am having a strange problem with my gear. I'm on Dynastar Altitrail Vertical Light skis with Dynafit bindings. I've got Dalbello Virus Tour boots. I weigh 85kg and the DIN setting on the heel is 8.
Here's what happens: I'll be diagonally traversing a 20-25 degree incline with the heel setting in the middle position and the front binding locked (the clip is all the way up) and then as i'm taking a step forward i just fall out of the bindings on one ski. What seems to be happening is that I'm twisting the heel with my pressure on the most-weighted ski and it is slipping into the next lowest position. This causes my boot heel to fall at an angle which in turn twists me out of the front binding points and then i'm left lying in the snow. This also happens when i've got the Dynafit heel on the highest setting.
I've spoken to a mountain guide about this and he says it should not happen. Others tell me that I should not be climbing diagonally with the heel raised - it should be on the flat setting. Still others tell me i should always be using my couteaux since this will give me greater stability. From all the video i've watched i've seen plenty of people doing what i'm doing with no couteax and with the heel on the middle or top position.
I've read another post on here about someone saying that the contact between the boot and the Dynafit heel is not good. I've looked at this and my boot has a raised bit of Vibram rubber where the contact with the heel binding is. The boot is basically sitting on top of the raised screw in the top plate of the heel binding. That is, it's not making a flat contact with the heel binding, it's connected with the screw only, and i wonder if all my weight on this one small point on the heel binding is creating too much pressure and causing it to twist.
So, since I don't know much about this, should I be climbing diagonally with the heel raised? Should I be wearing couteax? Or is there a problem with my bindings/boot combination? Or is it just bad technique on my part?