Remember to do only what is fun for you.Update:
Meh. I'm really rubbish at fighting with "advanced" loadouts. When I fit most slots with fixed weapons - even fixed Beams which should be easiest to use - I have real trouble hitting small ships at all, let alone landing enough shots to kill them.
Also, using Small Fixed Beams and Large PAs opens the new circumstance that I can only use one set at a time, bc one is hitscan and the other slow projectiles requiring a lot of lead. So, it is generally a dumb idea to outfit both fire groups as Fixed, and it would be better to use Gimballed lasers in conjunction with PAs?
I have experience with gimballed weapons only with the FDL, not the Chieftain. With the FDL I used 4 medium gimballed mcs and one huge PA or one huge efficient Fixed Beam either Thermal Vent or Thermal Conduit.
I did try fixed large rapid fire mcs on the Chieftain but the spin up was too slow for me. Maybe that is not the case for you.
I bet the Chieftain would shine with gimballed frags and small fixed beams or small long range rails. Not sure though.
o7