It must be a weird perspective as I am not that tall :-)
68 vs 67 was an interesting experience. The 68 doesnt feel crazy fast compared to the 67 but a lot more stable in the turns. I have to ride the ski on the front foot in the turns and stay nice and tall.
On the 67, I could push on the ski and snap turns which does not happen as easily with the 68. I am running stock settings and I am probably going to give long and shallow a go on my next ride which I ususally prefer on the longer ski.