To add the quality factor does require some significant tweaks it must be said. My current system (NOT compatible with EABA) which I intend to modify to fit in goes along the lines of...
Strikes have a damage rating (DR) which is the sum of the user's STR and any modifier for the weapon type an the like. Targets have a resilience level (RL) which is based on their size. I'm not getting into armour at this point!
Each hit may do damage within a 16 point "window" - your basic 3-18 roll, where 3 is the minimum damage applicable (a scratch) and 18 is the maximum damage you can do with the strike (probably severing/destruction of an extremity depending on hit location and damage type). There are a few levels of 'overkill' too for when big weapons hit smaller targets (see below).
When you hit you roll a standard EABA keep-three pool of dice, the size of your to-hit margin. Higher quality hits push the effect up the scale as for skill rolls. You then add your DR and subtract the target's RL. This means when you shoot Godzilla (Size 60) with a rifle (DR 7) it will always pull the damage off the bottom of the scale to no damage. Shoot a Size 7 person with the same rifle and the 'average' damage ends up being in the middle of the scale. Hit a size 7 human with a bigger gun, say DR 12, and you are much more likely to do crippling or 'overkill' level damage even with a 2-point margin.
I also use impairment levels, which are mapped from the 3-18 roll but could be mapped onto EABA damage tracks. The thing is that this type of damage is normalised before calculation, so you don't need ever-escalating numbers of dice for bigger creatures.
It's probably easier to explain with a chart...
