EXCESSIVE BACK PRESSURE WAS REQUIRED TO ROTATE B757-200 ON TKOF. THE SAME ACFT HAS BEEN WRITTEN-UP REPEATEDLY; BUT THE MALFUNCTION APPARENTLY STILL EXISTS.

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I REFUSED ACFT DUE TO CHRONIC FLT CTL ISSUE. I ORIGINALLY WROTE THIS UP SEVERAL DAYS AGO. AT ROTATION EXCESSIVE BACK PRESSURE REQUIRED TO ROTATE ACFT. FO LATER STATED I HAD PUT TOTAL OF 6 UNITS OF TRIM NOSE UP. FURTHER INFLT WE CONFIRMED WITH LOAD PLANNING OUR 3.5 ANU SETTING WAS CORRECT. ENTERED APPROPRIATE MAINT WRITE-UP. MAINT DID OPS CHECK AND SENT ACFT ON. TODAY; I PULLED UP BRIEFING TO FIND I WAS ASSIGNED THE SAME ACFT FOR MY FLT. AT XA19 I CONTACTED 757 MAINT. HE ADVISED HE HAD CONVERSATIONS WITH OTHERS IN HIS DEPT; AND FELT THIS WAS PLT ERROR; TAKING OFF WITH INCORRECT TRIM SETTING. I ADVISED HIM WE CONFIRMED OUR SETTING AFTER TAKEOFF. HE SAID ACFT WAS SIGNED OFF. I REFUSED ACFT APPROX XC00; ALSO SENT CONFIRMATION AT THE SAME TIME. NEITHER MADE IT INTO THE SYSTEM. ARRIVED AT XG00; STILL ASSIGNED SAME ACFT; CALLED DISPATCH AT XG19; REFUSED ACFT AGAIN. THERE HAVE BEEN THREE WRITE-UPS SINCE MY INITIAL WRITE-UP; PLUS I HAVE SPOKEN TO A FO WHO RECENTLY FLEW ACFT WHO ALSO CONFIRMS 'DEFINITELY MORE FORCE THAN NORMAL REQUIRED' TO ROTATE ACFT. IN MY OPINION THIS PROBLEM REQUIRES SERIOUS ATTENTION AND IS NOT DUE TO INCORRECT TRIM SETTINGS.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT AFTER HIS INITIAL WRITE-UP; THE SAME ANOMALY HAD BEEN EXPERIENCED BY TWO OTHER CREWS AND THE DISCREPANCY LOGGED BY THOSE CREWS. APPARENTLY NO MAINT ACTION HAD BEEN TAKEN AND THE EVENTS WERE ASSUMED TO HAVE BEEN INCORRECT TKOF TRIM SETTINGS. THE RPTR STATED THAT AFTER HIS REFUSAL OF THE ACFT; MAINT ACTION WAS PERFORMED. RPTR CONTENDS THAT THE PROBLEM STILL HAS NOT BEEN CORRECTED; BECAUSE ANOTHER FLT CREW HAS RECENTLY ENTERED A SIMILAR WRITE-UP ON THIS ACFT.