AN A300 PLT RPTS THAT AN ACFT HEAVIER THAN THE WT AND BAL INDICATED REQUIRED MUCH MORE NOSE UP TRIM AND A HIGHER APCH SPD THAN EXPECTED IN ORDER TO FLY.

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AT ROTATION IT TOOK BOTH HANDS ON CTL WHEEL TO PULL BACK FORCIBLY TO ROTATE. THE TRIM SETTING ACCORDING TO NUMBERS REQUIRED. I EVENTUALLY HAD TO TRIM TO 2.0 NU AFTER TKOF. NUMBERS SHOWED GREEN DOT 240 KTS. OUR GREEN DOT AFTER TKOF WENT TO 260 KTS. ALSO ON APCH ZZZ1 THE HOOK SHOWED 138 KTS. ALL OF THE ABOVE INFO INDICATED TO ME THAT WE WERE HEAVIER THAN OUR CLOSEOUT INDICATED. AT CRUISE I SENT A MSG TO DISPATCH TO ASK THEM TO RUN THE NUMBERS AGAIN. EVENTUALLY THRU ACARS WE DECIDED ON AN OFF LOAD AUDIT. THIS WAS MY FIRST EXPERIENCE FOR AN OFF LOAD AUDIT. DISPATCH SAID THAT AS CAPT I HAD TO BE THERE DURING THE AUDIT. OUR CREW REST FOR THE ZZZ-ZZZ1-ZZZ SEQ DOES NOT LEAVE TOO MUCH TIME FOR A DELAY INBND FOR IT TO IMPACT OUR DEP THE NEXT MORNING. I ACCEPTED DISPATCH'S DICTATE FOR ME TO STAY FOR THE AUDIT KNOWING THAT AFTER XA05 LCL TIME THE NEXT DAY'S DEP WOULD DELAYED. I WAS DOWN ON THE RAMP WATCHING THE OFF LOAD. TALKING TO MAINT PERSONNEL WHO TOLD ME THAT THEY HAD TO STICK THE TANKS AND THAT CARGO PERSONNEL WOULD CHECK EACH BAG IN THE CONTAINERS TO SEE WHAT TAG THEY HAD. EITHER A TAG THAT INDICATED LIGHT WT OR HEAVY WT. I WAS ADVISED TO GO TO OPS AND WORK WITH THE AGENT THERE. I WENT THRU CUSTOMS AND BACK AROUND TO OPS. BY THE TIME I GOT TO OPS I WAS ADVISED THAT THE WT TREND WAS SHOWING AT LEAST 600 LBS PLUS PER CONTAINER THAT THEY HAD ALREADY CHKED. IT WAS BECOMING APPARENT THAT MIA DID NOT COMPENSATE FOR THE HEAVY WT BAGS.