A DC9 FLC HAD DIFFICULTIES MAINTAINING VISUAL SEPARATION WITH THE PROCEEDING B727 DEP.

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THIS FLT WAS GIVEN TKOF CLRNC WITH RESTR TO MAINTAIN VISUAL SEPARATION FROM THE PRECEDING TKOF -- A B727. WE TOOK OFF ON THE SAME RWY AS THE B727 WE WERE TO MAINTAIN VISUAL SEPARATION WITH. I LEFT THE FLAPS OUT AND PULLED THE NOSE UP AFTER TKOF IN AN EFFORT TO MAINTAIN SPD COMPATIBILITY. I HAD TO TURN SLIGHTLY TO KEEP THE ACFT IN SIGHT AS HE WAS 'UNDER OUR NOSE.' WE WERE OUTCLBING HIM AT A SUBSTANTIAL RATE. WE WERE BOTH ASSIGNED A LEVELOFF OF 5000 FT. I TOLD THE FO TO TELL THE DEP CTLR WE TURNED 10 DEGS R TO KEEP TFC IN SIGHT. HE RESPONDED (DEP CTLR) 'ROGER.' WE DIDN'T TURN L BECAUSE THE OTHER PARALLEL RWY WAS ON OUR L OPERATING ON A DIFFERENT FREQ AND I DID NOT WANT TO ENCROACH. ALSO; THIS 10 DEG R TURN ALLOWED ME TO SEE THE B727 OUT OF MY WINDOW. THEN THE DEP CTLR GAVE THE DEPARTING B727 A 90 DEG R TURN. HE BEGAN HIS TURN THAT WOULD PLACE HIM IN THE NEAR FUTURE XING OUR FLT PATH AT OUR ALT. I REQUESTED A R TURN ALSO TO STAY INSIDE OF HIS TURN. DEP SAID 'NO' AND REMINDED ME THAT I ACCEPTED RESPONSIBILITY TO MAINTAIN VISUAL SEPARATION. I THEN TOOK A HARD L TURN WITH DEP APPROVAL; FOLLOWED BY AN IMMEDIATE R TURN TO FOLLOW TFC. THIS PUT THE TFC UNDER THE NOSE OF OUR ACFT AND CLBING -- OUT OF MY VIEW. THE FO TOLD ME HE COULD MAINTAIN VISUAL WITH TFC OUT OF HIS WINDOW. SO WE CONTINUED THE SERIES OF TURNS. MY OPINION: POOR TFC CTLING AND FREQ CONGESTION.