Sorry to dig up an old one,
@Philpug, but I'm trawling through this thread due to a dilemma and this touches on it without quite being specific to my case - weight comes into play. I recently tested a Rossi GS ski with a Look Rockerace SPX15. Normally, this would be skied with a PX18, but I have a very long boot sole, so my Z-value is 8. I asked for an SPX12 to be in the middle range, and the SPX15's range starts at 7. Unfortunately, the test centre was out of 12s, so I had to give the 15 a go. Seriously liked the ski, so I bought it, but without the bindings, with the intention of getting a 12 elsewhere. However, now I'm thinking weight and lever-length mean that despite my relatively low setting, the SPX12 wasn't made for me - I'm 6'2 and around 210 lbs. As I'm sure you're aware, Rossi specifically recommends that the ski be used with a PX18, or an SPX 15 in the case of a LIGHTER athlete. Am I right in thinking that would put the SPX12 in the category of EVEN LIGHTER THAN LIGHTER ATHLETE? All this has me wondering whether having tested the ski with an SPX15, I might miss the feeling and performance I enjoyed with what I assume is a less substantial housing on the SPX12, and whether I should really be getting the SPX15. Feeding into this dilemma is that I preferred it to a Head with EVO 16s mounted, and that the greater weight of the binding might have played a role in the Rossi feeling much more substantial and stable.
Someone has suggested to me that if I have the SPX15 tested and it releases at 8, then it's fine. Having not given too much thought to bindings before this issue arose, I'm not in a position to say whether that's right or not. I just know that I really liked the ski and would not want to miss the same feeling I had during the test if it's safe that way.
Grateful for any input.