Joe…
First of all i would suggest u to check the hardware….bcoz low CSSR is mainly due to the faulty hardware….may be TRX…may be duplexer…which also leads to huge call drops.For this u can chek the Alarms related to hardware.
secondly, which boundry r u talking about..is it a BSC boundry or INTERNATIONAL boundry.
Well u can check the frequency plan first, MAIO plan, HSN.