ACR X HAD LTSS FROM SMA Y. SYS ERROR. ACR X TCASII RA CLB.

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I ASSUMED OPERATING POS 17 MIN BEFORE OCCURRENCE DURING MY LAST HR OF ASSIGNED SHIFT. I INHERITED A COORD PROC WHICH I WAS BOTH UNFAMILIAR AND UNCOMFORTABLE WITH. (AN IFR ACFT WAS HOLDING AT BTV VORTAC AT 3000 FT. DEPS WERE BEING ISSUED HDGS 150 DEG; 170 DEG; AND 190 DEG WITH 190 DEG HDG RESTR TO 2000 FT FOR IFR OR 2500 FT FOR VFR TO PROTECT HOLDING ACFT. ALL SOUTHERLY DEPS OFF BTV ARE TOWARD TERRAIN.) TFC WAS VARIED AND MODERATE TO HVY. THROUGHOUT SESSION I WAS WORKING PRACTICE APCHS; OPPOSITE DIRECTION APCHS; COMBINED SECTORS; THROUGH FLTS; AND IT WAS VERY HAZY AND HOT. ACR X DEPARTED CLBING TO 2000 FT. AS SOON AS HOLDING TFC WAS NO LONGER A FACTOR I ISSUED THE NORMAL CLB TO 10000 FT. SMA Y WAS INBOUND FROM THE S DSNDING TO 4000 FT HDG TOWARDS VORTAC. WHEN ACFT WERE ABOUT 5 NM AND 1300 FT APART I NOTICED THEIR PROX. STOPPING CLB/DSCNT WOULD BE INEFFECTIVE. I TURNED ACR X 90 DEGS R AND SMA Y 40 DEGS R. ACR X WAS TCASII EQUIPPED. HE SAID TCASII CALLED FOR CLB RATE WHICH EXCEEDED CAPABILITY OF THE ACFT. IN THE FUTURE I WILL CORRECT COORD PROCS TO ONES WHICH I'M FAMILIAR WITH ASAP AFTER ASSUMING POS. GREATER AWARENESS OF ACFT PERFORMANCE ON HOT; HUMID DAYS (RACE HERE) WOULDN'T HURT.