Yeah, that is something I noticed when I played Subversive Tactics the first time as opposed to the second time with the same group.
The first time through, all the Heroes were strained out and had a difficult time with resting and activating. It worked well because they were constantly either prevented from activating their abilities or slowed because they couldn't strain for +1 movement.
The second time through, however, was a completely different story. Instead of trying to blow every strain they had on abilities, the heroes just calmed down, and waited on them, made sure to regularly remove strain with surges, and tried to purchase equipment and abilities that helped out with strain recovery (or at least didn't require a lot of strain to activate).
If the heroes know what Subversive Tactics is all about, and they plan against it from the beginning, I have found it becomes the worst of the initial three classes. Just my experience with it.