In another thread, I asked for input on the Kastle FX84 versus the Kastle FX94.I received advice on this question in this forum, in private messages on this web site, and from sources external to this website. All the the people who were kind enough to share their views with me are experienced and knowledgeable [even though they don't all agree with each other]. Having received presumably sound - and conflicting - advice from reliable sources, I've ordered the FX94 in 166 cm..
For reference, tip-waist-tail dimensions of the respective models I considered are:
FX84 122-84-110 [length 168 cm]
FX94 128-94-117 [length 166 cm]
All correspondence on the subject has impacted my decision in one way or another - especially reports of direct experiences with one or both of these models. But the overwhelming reason why I chose the wider waisted ski is really the essence of why I ski - I just LIKE that kind of ski. Wider waisted skis just FEEL GOOD to me. I have MORE FUN skiing them - and the reason I ski is PURE HEDONISM. Perhaps these statements won't seem reasonable to a person who helped me reach this decision, but - in the words of Blasé Pascal - "The heart has reasons that reason knows nothing of". To me, this is the essence of skiing. With the almost religious fervor and near mathematical certainty with which some skiing professionals argue their respective points of view, the essence of skiing is JOY. Unless patently unsafe to others, the only reasonable measure of skis, ski technique or instruction methodology is whether in the end it brings JOY to a PARTICULAR SKIER.