brewski - before you drill more holes into your skis in a "guess" regarding where your bindings should be mounted I recommend you take my advice to heart and really figure out where you should most likely be on the ski based on a BoF mount point. It's doubtful the "guys" in the shop know anything about BoF mounts - it's just not common knowledge these days thanks to the manufacturers adoption of the boot midsole mark.
The difference between 1cm and 2cm is huge in binding mounts. I know 10mm doesn't sound like much, but I've been amazed at how much change you actually get. I can even feel 5mm, but generally I won't remount for a 5mm adjustment - 10mm is a whole different story.