PS based EPT is something I was thinking about. I was thinking about a series of them that had bigger payoffs when you put them on ships with higher PSs.
For example-
I can't shake him.
If this ship has a target lock on a ship with a lower PS in its arc the other ship must set its dial face up.
Never tell me the odds
If this ship has a higher PS than a ship attacking it, it may add a focus result to it's defense roll.
Just a couple ideas but I think there should be a bigger payoff for having a higher PS.