Transition from Rossi Cut skis to Atomic ST7

Question
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Followup To
Question -
Hi -
I just skiied today on my new Atomic ST7 skis, 150CM.  I have been on Rossi Cut's 170CM (1998 vintage)and had a VERY hard time slipping all over the place.  Is this common first time out?  
I'm an intermediate skiier and found these to be pretty fast skis.
Meredith
Answer -
I have just returned from a ski trip so I am only now able to reply. Can you provide me with a little more information?

1) What category of ski is this? There is an ST11 in the race category and an SX7 in the Skiercross category. I am not aware of any ST7 unless it is next year's ski (it is not on Atomic's 05/06 website).
ST 7 is last year's model.  It stands for short turn.

2) Can you provide me with the ski dimensions (width at tip, middle and tail) and the radius of this 150? Don't know that.  

3) What was your reason for going to the 150 cm length?  I thought shorter would be better.  I am 5'7"

4) What type of snowpack and terrain are you encountering this problem on?
New Hampshire, where we have no real snow, just manmade stuff. Someone told me they may be "base high" and need to be ground down??

With a little more detail I may be able to help.

Glenn

Answer
Hi Meridith,

Step 1- have a shop, or a friend who understands the technology of ski tuning, check to make sure that your base is not convex (base high). You would hope not on a pair of new skis but these things can happen

Step 2- 150 cm skis can make the turn shape very short. The dimensions on an Atomic are usually on the bottom of the ski beside the length measurement. If you can find this please let me know what it is. However being a short turn ski in a modern sense means something quite different in terms of technique than the ski you owned before and from what you would have been on prior to that. How long have you been skiing for? The reason I ask is that technique plays a big factor in how confortable someone will be on the shorter lengths. For example I am 5'11" and 155 lbs. I ski a 160 cm Atomic LT11 (light or women's slalom race ski)about 80% most of the time. This gives me a highly responsive short radius ski at higher speeds. There is very little pivotting (turning by turning the feet and leg)and you need to commit yourself to getting the ski on edge and then moving the body quite far inside the arc. In other words you are not overtop the ski for very long. Otherwise the ski is going to slide sideways as you begin to go faster simply because  its length doesn't allow for much resistance to this. Is this what you are experiencing?

Glenn