A 3 SHIP FORMATION OF TWIN OTTERS CAME WITHIN 3 MI OF AN AIRLINER NEAR HDF.

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AFTER DROPPING SKYDIVERS FROM 16500 FT MSL; THE 3-SHIP FORMATION OF DH6'S I WAS LEADING PASSED WITHIN VISUAL RANGE OF AN AIRLINER EBOUND ON V64 APPROX 6-8 NM W OF THE PERRIS (L65) ARPT. I INFORMED SOCAL APCH 'DEHAVILLAND XA IN THE LEAD; FLT OF 3 DSNDING TO THE W (FOR PERRIS) SQUAWKING XXXX.' SOCAL ACKNOWLEDGED WITH RADAR CONTACT AND ALT VERIFICATION. SEVERAL OTHER RADIO XMISSIONS WERE ONGOING ON FREQ 134.0 WITH OTHER ACFT. VISUALLY SPOTTING AIRLINER TFC AHEAD EBOUND ON V64; I STARTED A DSNDING L TURN BACK TO THE PERRIS ARPT. SOCAL APCH THEN ISSUED A TA AND REQUESTED A R TURN NBOUND TO AVOID THE TFC. THE CTLR ALSO REALIZED THAT WE WERE ALREADY IN THE L TURN TO THE S; AMENDING HIS INSTRUCTIONS TO TIGHTEN THE TURN AND ROLLOUT NBOUND. ALL PLTS IN THE 3-SHIP FORMATION MAINTAINED THEIR VISUAL LOOKOUT AND WERE NOT AWARE OF ANY ACFT CAUSING A TFC CONFLICT FOR OUR VFR DSCNT. THE REST OF THE PROB IS DUE TO ATC SATURATION; 30-40% OF ALL XMISSIONS ARE NOT GETTING THROUGH ON THE FIRST ATTEMPT. CTLR WORKLOAD IS SO GREAT THAT NORMAL ATC SVCS ARE DISRUPTED AND DELAYED. THIS OVERSATURATION IS NOT THE NORM; IT MANIFESTS ITSELF FOR LIMITED TIME PERIODS ON WKENDS. LOA'S WITH LCL SKYDIVING OPERATORS HELP RELIEVE SOME WORKLOAD BUT AS CAPACITY INCREASES THE CURRENT SYS BECOMES EASILY SATURATED DEGRADING THE SVCS PROVIDED BY ATC.