Replying to Adjusting heel piece on MFD Alltimes?

I got new boots that are a touch smaller than my previous ones so I have to adjust my bindings a bit. Does anyone know if there's any reason why I shouldn't just use a screw driver to take out the screws, move them up a notch to the correct setting, and rescrew them in?

I got them to unscrew by hand so I'm guessing just a really good hand tightening and monitoring their tension periodically should be enough, but I imagine MFD has a specific torque that should applied. Note that they're FKS and can't slide on their heel piece like other bindings (unless I'm wrong on this...).

Thanks for any input!