Sub Surface Combat and US dud rate

[apbarog]

I've noticed a number of sub surface combats, with US subs, that have multiple successful torpedo hits, in 1942. This is just a suspicion, but when the Jap convoy is not escorted, and the sub surfaces to fight it out, the US sub torpedo success rate "seems" to be higher than the typical non-surface battle. This may just be "bad luck", but I'd like for it to be looked at.

As the Japanese player, I always try to throw in at least one escort, just to keep the sub from surfacing. I have a save attached where I forgot to do this. This example was the US sub Porpoise attacking in hex 85,68.

This save shows an example of 2 successful torpedo hits in one attack by a US sub in 1942. If just 2 torpedoes were fired, with a 90% dud rate, the odds of this was 1 in 100. If more were fired, then it was more possible.

Again, I'm not saying this is a bug, just that it might be that the dud rate isn't being checked correctly in this circumstance.

Thanks.

[edit] scenario 1, PBEM

[Lecivius]

One thing I have noticed in such attacks is Japanese Merchant gunnery is truely awe inspiring, hitting with @ 70% to 80% accuracy (secnario 8 vs AI).  I understand the dud rate (even though it makes me want to viloently interact with my PC).  But from what I have read Japanese merchant gunnery, while an area of concern,  was not better than IJN gunnery standards.
 
Thoughts?