I would be tempted to put Vulcans in small mounts and Pilums in medium mounts. Venture does this better by mounting more missiles (and has Fast Missile Racks), two dual flak, and either a pulse laser or heavy blaster. Sometimes, I get annoyed with Venture and want to not use missiles and focus solely on non-missile stuff. Of course, this was before Venture became too slow (with burn 7) and hopelessly outclassed by alternatives.
If I wanted no missiles, I would probably put nothing or 0 OP Harpoon/Sabots, and focus on ballistics. Hmmm... then again, I would probably be better off using Gemini with Mauler and HVD or maybe beam and Mauler (or HVD) Heron. Of course, fighters need to be useful again. In my last game, I totally ignored carriers due to fighters being obsolete in the endgame.
Yes, low OP ships are no fun. This is one reason why I like skills and put so much scorn on the baseline. Almost every ship has too few OP without skills. With even max OP from skills, some ships still do not quite have enough. This is the Hammerhead's biggest weakness. It would not be so bad if Hammerhead had decent flux stats, but they are almost as bad as an Enforcer, and it needs some capacitors to support its ship system. This means after getting the obligatory hullmods and max vents, it has to go cheap with weapons to barely have enough, even with max OP.