FO OF AN MLG ACR ACFT OVERSHOT DEP FIX ALT DUE TO HVY WORKLOAD AND TCASII ALERT DISTRS.

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ALT BUST ON BACK BAY 1 SID. WE CLBED TO 7400 FT PRIOR TO FIX (F147K) ON THE BACK BAY 1 DEP. I BELIEVE THERE ARE TOO MANY XING AND TURNS ON THE BACK BAY 1 DEP. OUT OF SNA; WE ALREADY DO A SPECIAL TKOF WITH PWR REDUCTION AT 1000 FT; PLUS LOOK FOR LIGHT ACFT. PER OPS MANUAL OUT OF SNA WE TKOF MAX PWR TO 1000 FT (THIS DAY) PWR REDUCTION TO 78 PERCENT FOR NOISE; FLT DIRECTOR OFF; CLB TO 3000 FT AT V2 PLUS 15; OR SHORELINE AND CLEAN UP. DURING CLEAN-UP WITH XING ALTS AND TURN TO MAKE FIX (F147K) WE HAD 3 TA'S ON TCASII. WHEN FLT DIRECTOR IS PUT ON IN OUR MLG; NO ALT GIVEN ON TCASII; IT GOES TO HDG SELECT MODE; SO THE HSI IS GETTING NAV INFO FROM FMS AND FLT DIRECTOR IS IN HDG MODE. HSI GAVE ME A TURN TO FIX (F147K) AND FLT DIRECTOR WANTS TO GO STRAIGHT AHEAD IN HDG MODE. MADE TURN OK; BUT WITH LOOKING FOR TA'S AND CLEAN-UP PROCESS; I CLBED TO 7400 FT BEFORE F147K. IN MY OPINION; DOING THE SPECIAL NOISE DEP WITH PWR REDUCTION AND PITCH ANGLE AND MAKING ALT XING AND TURNS IS TOO BUSY FOR THE TIME AND DISTANCE.