I have the ATV but I'm still only using it once and a while.
I remember a guy called 'davester' who showed a way to use the Clevelands (which I have also) and from the rough it was always full BS and add power. But from the sand he showed an image that indicated to put the spin dot down to the level of the sand, but not full BS under the sand because this 'affects the shot and creates inconsistencies, esp. the aim' or something.
So, sometimes when I hit from the bunker I'll put the spin dot down right on the level of the sand, maybe just a little down into it, but usually never full BS.
I am still testing out the success of this technique to this day.
edit: this thread shows a mapping w/ pitch, chip and flop
results will vary