I wonder, perhaps we should volley fire as much as we can? You are going to fail that charge anyways.
I mean, you can declare a charge from 12" away...but you I4 marines can only ever roll a max of 9". In fact the average roll is 7.46", or 5.46" for Cataphractii.
You'd need to move at least at M16" to be able to charge the full 12", and that's on a 6.
I wonder if Setup + 2d6 charge would be too opressive...but wouldn't it balance things out in this Shooting Edition?