DEP CTLR HAD LESS THAN STANDARD SEPARATION BETWEEN ACR ACFT OFF 2 DIFFERENT ARPTS ON CONVERGING VECTORS.

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ON DEP CLB OFF EWR RWY 4L; OUR FLT; LGT X; WAS ASSIGNED HDG 060 DEGS AND 5000'. AFTER REACHING 5000' AND WHILE HDG 060 DEGS; EWR DEP GAVE US A RIGHT TURN TO HDG 120 DEGS TO INTERCEPT THE TETERBORO 125 DEG R. JUST AFTER RECEIVING THIS VECTOR; THE CTLR REVOKED THE RIGHT TURN; ASKED US TO REVERSE THE TURN BACK TO 060 DEGS AND CHANGED FREQS. AFTER CHKING IN ON THE NEXT FREQ; WE WERE GIVEN A TURN TO THE RIGHT THAT TOOK US BEHIND AN MLG Y THAT WAS LEVEL WITH US AT 5000'. CTLR REMARKED THAT HORIZ SEP WAS ROUGHLY 2 MI AND GAVE US CLB CLRNC TO 10000'. BELIEVE SITUATION OCCURRED DUE TO COMPLEXITY OF DEP GND TRACKS/ATC SECTORIZATION AND DUE TO HIGH DENSITY OF TFC. SUPPLEMENTAL INFO FROM ACN 84084: SEVERAL ATTEMPTS TO CONTACT 120.4 WERE BLOCKED. AFTER CONTACT ESTABLISHED; NY DEP CALLED TFC AT 12-1 O'CLOCK; SAME ALT; AND ISSUED AN 'IMMEDIATE CLB TO 10000.' AS TFC WAS 'LESS THAN 2 MI;' WE REMAINED LEVEL AS VISUAL CONTACT INDICATED WE WOULD PASS BEHIND TFC AND NOTIFIED ATC OF SUCH. WE THEN RECEIVED A RECLRNC TO 10000'. SUSPECT HDOF TO LGA FROM EWR DEP DID NOT INDICATE OUR LAST CLRNC OF 060 DEG HDG. NEED A MORE POSITIVE HDOF IN THIS DEP CORRIDOR TO THE NE.