How effective are CM's?

[Captain Nemo]

Decided to fire up DW (first time in several months) and play a quick ASW mission in an LA class boat. Managed to pick up the enemy sub fairly quckly using both sphere and towed array. Got a good solution at around 5,500 yards and decided to fire a MK48 active torpedo at the enemy enabling after a run of about 4,500 yards. Within about 15 seconds of launching the enemy sub fired off a snapshot. I decided to run away from the enemy torp at about 24 knots whilst retracting my towed array at around 800 feet depth. Launched a passive and active CM. After about a minute I launched another couple of CM's and did a 90 degree course change and went very deep at 1,500 feet. Then the pinging started. From looking at the active intercept in sonar it looked like the torp had acquired my boat and was heading straight towards my stern. At this point I decided to launch two active CM's and do another 90 degree course change in the hope of throwing off the torp. No luck there, the torp changed course and is still on my tail. Launched two more active CM's and another 90 degree course change, towed array is now reeled in so increase speed to 32 knots. Pinging is now more intense and rapid than ever and torp is still homing in on me. As a make or break I decide to launch two more active CM's and another 90 degree course change. Managed the turn then its all over I'm heading to the bottom.

Whilst this is all going on my MK48 has acquired the enemy subs CM and is heading for the surface. Torp passes CM after broaching the surface and re-acquires and heads deep. After about a minute the enemy sub is heading for the bottom. Some consolation at least.

Anyway my question is how effective are CM's? The AI one seemed quite effective even though the end result was the same. In my case I launched several CM's but none of them seemed to have any effect whatsoever on the enemy torp. Replay confirmed this. I'm using LWAMI 3.02 and am patched to 1.03.

Nemo