I do lots of weapon swaps: (probably overkill but I try to squeeze as much out as possible)
Excal/Duban at the start for doing D objective. Seraph > RLB > Flat > Savage > KoR.
After D (depending on DD) I swap to Burt/Svrista for kiting H. Overkill but damage doesn't matter and losing hate is the only possible issue.
After H its Reikiko/Duban (or Aegis) for doing CBA bosses.
Once down in F I swap to Burt/Aegis for kiting and leave that on through G and E.
Excal/Aegis for Aminon.
Tips: I banish2 C/G plus the mentioned JAs. Save SP1 incase you need to blow it for a bad bitzer. Tank G at 5.5 and have your teammates stand at max distance on the other side. If you are doing Naaks/Flans after Aminon save Sentinel after WC during Aminon for quick snap hate after the mobs are tagged. PLD can do respectable damage on Aminon don't sleep on your contribution.