EW Sensors

Here's a simple but icky solution.

If target ESM = shooter EW, shoot as usual.
If target ESM one notch better than shooter EW, roll D6.  On a 5 or 6,
counts as having one higher level screen (or can't shoot, or one longer
range).
If target ESM 2 notches better (Superior vs. basic), roll D6.  On a 4,5,
counts as above.  On 6, counts double the above.

Now that makes superior ESM worth far more than currently priced /
massed, I
expect.