sometimes even a large port can't fully re-arm an arriving TF. an arriving CV TF (low on available sorties) will usually need 2 days in port to fully refuel and re-arm.
-a Port has an inherent ability, but is limited by its size and on-hand supply. it will try to re-arm/re-fuel arriving TFs, set arriving TFs to Min Refuel or Do Not Refuel to lighten the load.
-Port's re-arm size ability can be increased by NavSupport from an in-hex LCU.
-loaded AE ships disbanded in the port can re-arm ships, their re-load ops-points are spent separately from the port's points. if an AD was present, that ship could re-arm DDs, leaving the AEs to re-arm the BBs. each turn, tag the port's 'Reload Tenders' button to resupply them.
-arriving BB TF set to Full Refuel would've pulled more fuel than ammo, set it to Min or Tac Refuel.
-not all AE/AKE types are big enough to provide 16" shells. divide BB TFs between 16" & 14" types.
this will help, but you've got too many BBs trying to load from a small hose. can you divide the TF into 2 halves, & send one out to bombard while the 2nd re-arms in the port?