AN A320 CREW RECEIVED REVISED WT AND BAL INFO IN FLT INDICATING THE ACFT WAS 1200 LBS TOO HEAVY FOR A REDUCED THRUST TKOF CONDUCTED EARLIER.

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WE WERE TAXIING OUT AND RECEIVED OUR FINAL NUMBERS WHICH INDICATED A ZERO FUEL WT OF 116;850 LBS. WE PLUGGED THE NUMBERS INTO THE FMGC AND WERE OK FOR A REDUCED THRUST TAKE OFF AT A REDUCED TEMP OF 61 DEGS. OUR TAKE OFF GROSS WT WAS 143;200 LBS WHICH WAS UNDER OUR ALLOWABLE TAKE OFF WEIGHT OF 143;600 LBS. AFTER LEVELING OFF AT CRUISE; WE RECEIVED ANOTHER FINAL WT MANIFEST; THE ZERO FUEL WEIGHT HAD GONE UP TO 118;400 LBS. THIS MADE OUR ACTUAL TAKE OFF GROSS WEIGHT 144;800 LBS. THE REASON FOR THE WT GOING UP WAS AN ADDITION IN PAX COUNT OF 4. WE HAD THE FLIGHT ATTENDANTS COUNT THE PAX ON BOARD AND THE SECOND WT MANIFEST WHICH WE RECEIVED AT CRUISE WAS ACCURATE. WE TOOK OFF WITH REDUCED THRUST BUT IF WE HAD KNOWN OUR ACTUAL WT BEFORE TAKE OFF; OBVIOUSLY WE WOULD NOT HAVE TAKEN OFF REDUCED THRUST. IN THIS CASE; WE DID FOLLOW NORMAL OPERATING PROCS WITH THE INFORMATION WE HAD. SEEMS LIKE; LOAD PLANNING DROPPED THE BALL AS WE RECEIVED THE SECONDARY FINAL WTS AFTER REACHING CRUISE ALT. THERE IS NOTHING WE COULD HAVE DONE DIFFERENTLY. IN MY 5 PLUS YEARS WE HAVE NEVER RECEIVED WTS AFTER REACHING CRUISE. NORMALLY; IF THERE ARE UPDATED WTS WE RECEIVE THEM WHILE TAXIING. AGAIN; I DON'T KNOW WHAT HAPPENED; MAYBE THE ACARS WAS DELAYED OR MAYBE LOAD PLANNING DROPPED THE BALL. EITHER WAY I BELIEVE WE FOLLOWED STANDARD OPERATING PROCS.