I think if you are going to make use of the internal bomb bay quirk, you should probably go all in to maximize the flexibility of the bay loadouts. So instead of LRMs and a 1 ton bay, a 6 ton bay so you can mount more AA missiles or an anti-ship missile, or lots of bombs. I do like the modern approach of a machine gun for ICE powered aircraft as a backup weapon. This would make a 'F16' analog at the same 20 tons loaded weight, and the ability to do 6 internal RL10s/bombs+4 external for strike missions or 3 internal plus 2 wing AA missiles for interception roles.
If you dont use an internal bomb bay, thats when I like the LRM loadout to try and swarm larger craft at long range, as conventionals dont have the armor to muck about in protracted short range dogfights. An important point is that, with a low thrust, you also have a very low SI, so you cant really push this fighter very hard... it likes flying in its comfort zone. Its not a sprinter in other words, it will need time to build energy safely to avoid stress tests from the 5 SI.