Handlepole length on Rickter XFS

Does anyone have any rule of thumb measurements on how long the handlepole on an XFS should be for a certain height of person. Also, where would you measure from/between?

I think mine is too long as the ski rides really high and is hard to get onto the plane. It would be helpful if I could have some idea where to start from, with the adjustments. I'm 5'11''
Thanks for any advice.
 
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