I dont think it would work, what about fighters? They never do much damage, and since they all act as their own unit now rather then stacking up to deal more damage, everyone would fly with emissive armor and make fighters obsolete because they cant damage any of the ships. To me the percentage system made more sense. Hey I loved it too in those odd times when you got emissive armor III and came across a ship that couldent hurt you at all
but it was unbalanced. IMO and this actually would make it more usefull against heavy weaspons, if your getting delt say 200 pts of damage which would you rather have a measly 15 pts taken of or 15% resisted, I would take the 15%!