After learning to fly the ships better and experimenting more, I've determined that these are casual-only. Some of my lists do a good job at holding their own or even beating the meta fleets, but this is definitely not one of them.
Gunboats are simply not versatile enough, and it's too hard to put the pressure on when the situation calls for it, or line up the next round of attacks.
I haven't tried the pocket ace variant, but I suspect that will not be enough to change the fleet's fortunes. The core issue remains: gunboats just can't move the way they need to in order to tango with serious fleets.
I plan to play the pocket ace version at some point, but in casual play. Right now I'm trying to find something I want to fly for the Intermountain Cup tournament, and this is not it. I suspect the ace version will be a fun variant for casual games though, so I'll try to report back when I get to give it a try.