CTLR COMPLAINT ABOUT SKYDIVING OPERATIONS NEAR VICTOR AIRWAY AND PLT NON COMPLIANCE WITH TRAFFIC ADVISORIES.

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I AM A CTLR AT ZOA ARTCC. I HAVE BEEN QUALIFIED AS SECTOR #11 (FROM SJC TO SNS TO PAN TO OAK FROM SURFACE TO FL230) FOR 14 MONTHS. IN THIS TIME THE INCIDENTS DESCRIBED HEREIN HAVE OCCURRED WITH ALARMING FREQUENCY. THERE ARE 2 ACFT; BOTH SMA TYPE; WHICH CLB OUT IN VFR CONDITIONS TO 12500' MSL FOR THE PURPOSE OF PARACHUTE JUMPING. ONE OPERATES OUT OF HOLLISTER; THE OTHER FROM TRES PINOS. BOTH ACFT CALL SECTOR 11 FOR ADVISORIES; IN ACCORDANCE WITH FAR 105. THE PROB IS IN WHAT THEY DO WITH TFC ADVISORIES. I HAVE HAD TO INSTRUCT PLTS OF BOTH ACFT TO 'DELAY THE JUMP' UNTIL TFC CLEARS; SINCE THEY SELDOM GET TFC IN SIGHT. IT SEEMS THEY WOULD GLADLY KICK JUMPERS OUT KNOWING THERE'S TFC IN THE AREA; BUT NOT IN SIGHT. ADDITIONALLY; THE RADAR COVERAGE IS POOR AT BEST (SEE ACCOMPANYING RPT) IN THIS AREA. WE FREQUENTLY LOSE ACFT (EQUIPPED WITH TRANSPONDER) AT ALTS BELOW 8000' MSL. THE JUMP ZONES LIE ON A VICTOR ARWY (V485); ON THE FINAL TO ONE OF THE BAY AREA'S BUSIEST ARPTS; WHERE HUNDREDS OF JETS/TURBOPROPS ARE VECTORED FOR SEQUENCING; ETC; DSNDING TO 8000' EACH DAY. MUCH TIME AND ENERGY IS SPENT TRYING TO AIM THESE JUMP ACFT AWAY FROM IFR INBNDS; VFR ACFT; AND EACH OTHER (THEY CLB OUT TO JUMP ALT IN THE SAME VICINITY; BUT DON'T COOPERATE WITH ONE ANOTHER). FINALLY; ALTHOUGH BOTH JUMP ZONES ARE LISTED IN THE NOAA ARPT/FAC DIRECTORY; THEY ARE NOT CHARTED ON THE CURRENT SECTIONAL.