Thanks Kapitan for those helpful points. Just some answers:
1. Just a quick scenario I whipped up - placed a 688 in some water, placed my Sierra II 10ish miles away
2. No - I thought all AI subs had their TAs deployed?
3. I was on the same layer as he was - I didn't think firing under the layer would make a big difference from that range - is that wrong?
4. Just by chance (he was running random in a box) I came at from the bow. I drew a 5.5 NM circle around him and tried the 'follow' the edge of it around at 1-2 kts until I was on his beam - I figured if I didn't then, the range would start to increase (he was going 5 kts)
Thanks for those evasion tips - I need to do more sprinting and drifting!
I also need to study the weapons manual more - I usually just fire on 'default settings' Maybe giving him a passive torp would make him think a bit more??
Stew