I have never run with Gunner but after reading these forums I am going to try throwing him in crew slot and seeing how he works.
I usually run Space Cows with FCS. Free TL every attack for 2 points is worth it to me. Not sure if I'd run with Gunner, I'm usually considering EU with those points instead.
However throwing 5 more points on a base 21 point shuttle is not the same as a 50+Falcon. That's a lot of points and you need to hit since your single attack is over half your fleet points.
If I ran Falcons I'd probably do the same. My 20-something point shuttle misses with one re-roll+focus...and I've got another 70-ish points of fleet to play with...your Falcon misses and you are down to your escort pair/mini swarm/ or mayhap other Falcon?