I think mine is competent + ATM and seems useful enough, I use the fighter for pursuit and shield attack and the Keelback for hull killing so I use frags and rails currently (almost 10 x your DPS) and about half your hull strength, although there's a fair bit of high level engineering in my build in thrusters, hull, shields, weapons etc.
https://coriolis.edcd.io/outfit/kee...2727.Iw18UA==.MwBhCYy6YFlkQ===.&bn=Combat hvy
Do you let your crew fly the fighter or KB? Or do you fly the fighter to take down the shields then swap to the KB for the hull?
Currently I'm letting the crew hang in the fighter most of the time.
I thought about small rails as I loved them on my Cobra MK IV but the KB really does handle like a whale and I haven't so far been able to get fixed weapons to work for me with it yet. Haven't tried frags before but given I'm often out run I wouldn't have thought they'd be as useful as say cannons or MC's. Willing to give it a shot though I have enough for a few rebuys.
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You really gotta hold their hand until they get to expert, but it's worth it in terms of money saved in the long run, and feels more like an accomplishment. To me anyway. If money isn't a factor, then get an expert right away. I have mine up to Deadly.
Yeah I might bite the bullet and get a higher level one until I get some engineering done to the KB then train one up a bit.