viking:
welcome. All those holes are actually for mounting various size boots. In my case, I have a 314 mm boot sole, so the binding mounts in the front hole for the toe piece and I couldn't move it forward any more (without redrilling, as you say). However, if your wife's boot sole length is short enough that the toe piece doesn't screw into the frontmost hole, then you may be able to move the toepiece forward a bit by removing the binding from the plate and screwing it down in a bit farther forward holes. I played around some with that, and the threads appeared to be self-tapping. For what it's Worth, there is also some finer adjustment underthe heelpiece (a little lever that you lift up) and the forward pressure also needs to be checked after you move them (if you do)l
Harald Harb, who knows Head skis is the first that I heard recommending that all Railflex skis be skied in the +15 position,but he and Diana recommend skiing the CP13 plate in the default position, and that has worked well on my i.SL Chips with the CP13 plate and LD12 bindings.
Just information, not sure to recommend whether you try to move the bindings forward or ask the shop to try to find a forward mounting position of the bindings on the plate. I would not recommend re-drilling the skis.