[Havan_IronOak]

I have a number of mods loaded that work fine. It's just a matter of learning where to put everything. Many Steam players don't bother.

I'm like you so far using the get in front/get deep and silent/rise up after the lead destroyer passes method.

One variant that I use. I don't bother to identify anything.
I time the merchants as I'm closing using their sound contacts
3 minute intervals - meters traveled divided by 100 is their speed in knots

Plot a Dick O Kane solution line and then stay submerged until the sound contacts get close to that line.
Preset all the tubes with the speed (range doesn't matter)
Set the bearing and AOB based on the O Kane solution
Surface just long enough to release your fish on one or two targets then go deep and evade

Sure you only get two or three ships out of a convoy but that's way better than wasting all your fish when a refit is so far away.

Here's a great you-tube video that walks you through the Dick O Kane method

Since I adopted this style I generally average 2 ships sunk per convoy and with single merchants I'm getting over 80% hits.

Kudos to Rockin Robbins for his info on this method as well. The guy I linked to, learned it from him.