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Were they all mounted at the same place?
When getting my big, floppy skis mounted I get them to go down a size on the drillbit (I eat too many pies and carry a bit more weight than I should). I haven't ripped out a binding since - my theory is that the slightly smaller hole gives the screw just a little more grip and stops moisture getting in.
I reckon once a binding starts to pull out a little you start having issues with water getting into the core. I have a pair of Hellbents decorating my garage wall because they got water in the core and it turned to mush around the screw holes. Even helicoils rip out.
Pipe_Munkyfor all of you saying FKS, that heel has a tighter screw pattern than Marker making it more likely to pull out.
you problem is your skis. get new ones!