@Nateinnet I would start with the same 10' and 1/2" he is on now. However, I would also start with a neutral pitch, see what happens then go from there. This way there is really only one variable. In my own experience I ended up with a neutral pitch after having skated "very" pitched forward previously. I am beginning to develop the opinion that many people, including myself have way overdone the forward pitch thing. With the Marsblade I think it is more about finding that sweet spot that makes it click. It seems to excel at anything involving a heel pump. All said, the conservative part of me agrees with others about doing all of this with a second pair of skates.
@SkateWorksPNW my experience was opposite as your clients. I found that my previous "long" profile (similar to Quad 2) didn't really do much with the Marsblade. It just kind of felt the same with or without the Marsblade. I ended up with a Quad Zero. On the Marsblade the Quad Zero feels like there is more steel on the ice than it does in a traditional fixed holder but with the benefits of the shorter radii. It just sort of skates longer. I know that you didn't really care for the Marsblade but as I said it before, I'd love to hear more feedback about your experiences.