... hey CALencioni,
Short answer, the MacKite guys are right!
Higher V position can enhance the feel of tighter turning radius on some kites and I believe the Dice falls into that category,,,,,, but you can also loose a bit on the static power along with upwind. Too much higher and you can kill the kites character completely too.
I was replacing my North Dyno 18m with an Ozone Edge 19m years ago but didn't like the slower sluggish turning of the Edge. Playing with the V height on my bar, moving 0.5m every few runs, I found a good compromise where the turning felt tighter and more positive with the kite feeling more solid, but I also found the static power and upwind wasn't as good. I much prefer the new tighter turning feel and was willing to sacrifice the little bit less power and upwind abilities.
I tried the same experiment on different kites and found only bridled kites seem to have any achievable positive effects but I also found if you go too high everything got worse with no benefits at all. My mates V3 Zephyr liked a slightly higher V but another mates V5 Zephyr got worse from the get go.
I recently got a new Juice 13m and same thing, experimenting with a higher Y I achieved the tighter more solid turning feel I like and seeing as I only used the Juice on a foil I can sacrifice a tiny loss of static power and its upwind.
Oh, btw, note: make sure you trim the back lines to compensate for a higher Y,,,,,, as you take the Y higher you are effectively shortening the front lines so therefore you need to compensate by shortening the back lines a bit to suit,,,,, unless you like it then leave it of course.
Try it ans let us know how you go.