688 help again

I am having the worst time in the single mission Against All Odds. I know it is the hardest onein the game but for the life of me I cant get a torpedo to hit anything. I travel south like the online manuals tell me to. I start to pick up the two slavas and still no akuls to be found. I am using ESm bearings and getting short fixes on them. I get them past me and start to turn arounsd to shoot them from behind.

I am locking for 10-15 mintues and still I cant get a torpedo to hit anythign they just go rightby or shutdown on me. I know they are well with range ( sometimes as close as 10,000)

they are acting like i have no fix on them when I have been tracking them for sometime.

I am about to lose my mind

Any help