B737-400 FLT CREW HAS WT AND BALANCE ISSUES AFTER TKOF. ACFT IS HARD TO TRIM AND FLT CREW DISCOVERS EXCESSIVE BAGGAGE WAS LOADED AND NOT RPTED.

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UPON DEP ROLL AT PDX; THE FO REMARKED THAT HE HAD TO USE EXCESSIVE PRESSURES AND TRIM TO FLY THE ACFT COMPARED TO WHAT HE NORMALLY EXPERIENCED. DURING CLBOUT; I CONTACTED OPERATIONS TO ASK THEM TO REVIEW THE WT AND BALANCE COMPUTATIONS AS THE ACFT DID NOT FEEL RIGHT ON TKOF. THEY CHKED THE DATA AND CONFIRMED THE COMPUTATIONS WERE DONE CORRECTLY AND THAT NOTHING WAS AMISS. THEY ALSO MENTIONED THAT 20 TRANSFER BAGS THAT POTENTIALLY COULD HAVE BEEN ON THE ACFT WERE NOT BOARDED AS THE INBOUND FLT WITH THOSE BAGS HAD NOT YET ARRIVED. A FEW MINUTES LATER THE OPS AGENT INITIATED CONTACT WITH US TO NOTIFY US THAT SOME 20 ADDITIONAL BAGS WERE ACTUALLY BOARDED IN THE AFT PIT. AT THAT POINT I WAS CONFUSED AS TO WHAT BAGS THEY WERE IF THE INBOUND TRANSFER ACFT HAD NOT YET ARRIVED. I SUBSEQUENTLY CONTACTED DISPATCH TO REQUEST A PHONE PATCH WITH THE DUTY OFFICE TO ASSESS THE CIRCUMSTANCES AND REVIEW AN APPROPRIATE COURSE OF ACTION. AFTER SEVERAL ATTEMPTS THE DISPATCHER SAID THAT HE WAS UNABLE TO PATCH THE DUTY OFFICE ON TO THE FREQ BUT THAT HE WOULD RELAY MY CIRCUMSTANCES TO HIM. I THEN REQUESTED THAT A BAGGAGE/CARGO AUDIT BE PERFORMED UPON ARR. I ALSO REQUESTED THAT THE NEW WTS AND CG BE PROVIDED TO US AS WE OBVIOUSLY DEPARTED WITH INCORRECT WT AND BALANCE INFO. THE REVISED INFO REVEALED A 400 LB INCREASE IN THE ACFT ZFW; A 500 LB INCREASE IN ACFT TOW AND A 2.7 PERCENT AFT CG SHIFT. APPROX 30 MINUTES AFTER ARR; THE INDIVIDUAL THAT PERFORMED THE INBOUND BAGGAGE AUDIT DISCLOSED TO ME THAT THEY FOUND AN ADDITIONAL 630 LBS OF BAGS LOADED IN PIT 6 THAT HAD NOT BEEN COMPUTED IN THE ORIGINAL WT AND BAL COMPUTATIONS. HE INDICATED THAT THEY WERE GOING TO FILE A RPT ON THE MATTER.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR INDICATED THAT THE PROBLEM WITH THE INCORRECT LOADING OF THE BAGGAGE CARGO IS AN ONGOING PROBLEM AND APPEARS TO STEM FROM THE COMPANY OUTSOURCING THE RAMP OPERATION TO ANOTHER COMPANY. THE COMPANY OPERATIONS AGENT SENDS THE LOAD PLAN TO THE RAMP PERSONNEL AND THE COMMUNICATIONS APPEAR TO BREAK DOWN. HE INDICATED THAT THE TRAINING AND PROCS SEEM TO BE LACKING. ADDITIONALLY; IT APPEARS THAT BAGS ARRIVE FROM OTHER CARRIERS AND THE RPTR IS WORRIED THAT THE MATERIAL HAS NOT BEEN CHKED PROPERLY FOR SECURITY. THE CREW RECEIVES THE LOAD MANIFEST VIA ACARS AND THIS IS THE ONLY SOURCE THEY HAVE TO LOAD THE INFO INTO THE FMC FOR CG AND ATOG WITH REGARD TO ACFT PERFORMANCE. THE FLT CREW IS AT THE MERCY OF THE RAMP PERSONNEL AND THE OPERATIONS AGENT TO ENSURE THAT THE ACFT IS LOADED PROPERLY AND WITHIN CG/WT LIMITS. THE RPTR INDICATED THAT THE FO WAS THE PF AND THAT AT LIFTOFF; THE ACFT WAS EXCESSIVELY NOSE HVY AND THIS PROMPTED THE FLT CREW TO QUERY THE COMPANY TO INVESTIGATE THE ACFT LOADING. THIS IS WHEN IT WAS FOUND THAT THE ACFT WAS LOADED IMPROPERLY AND THAT IT WAS IN EXCESS OF 600 LBS OVER THE MANIFEST RPTED WT.