I'm an East Coast skier looking to replace my groomer/hard snow ski. Blizzard Magnum 8.1s (in 172) have filled this nitch for me the past couple years. I liked them but a lot but found they veered a bit closer to an Eastern "all mountain" ski than a carving/hard snow dedicated ski. At the time I bought them this was great as they were my only skis but in the intervening years I've picked up some other skis and now that they are showing their miles I looking to replace them with something a bit narrower and more specific.
I've narrowed it down to the Supershape Rally and the MX78 but am unsure on sizing for these and would be curious about others experiences with them as demoing was is not possible (specifically for the Kastle skis, as they have such limited distribution).
My instinct with a hard snow carving ski is to go shorter (which would be 170 and 168 respectively) but I was hoping to get some input.
I'm 5'9", 175ish lbs.
Other skis I'm on are Fischer Watea 88 in 176 and Head Rev 105 in 181.
Edit: Would probably have helped if I had spelled "i.Supershape" correctly in the thread title.
Mod edit: fixed title