Depth Charges again in Wolfpack

[Tempest5]

I took the Getting Started Scenario modified so the U-Boat is at Periscope Depth. My chasers are all over it (because I have Fog of War off).
Nothing....except damage when I hit the periscope. I played with stock DC 2.5 damage values and even increased it to 15.5 for the time period.
Nothing. Das Boat is invulnerable underwater. Everything else works. Can someone check this. I believe somethings is off.
Scenario isn't realistic it is just to test how effective Depth Charges are. You start right in front of the U-boat.

[Tempest5]

Okay I did some playing around with this scenario and the stock parameters work fine with the U-Boat is submerged. The problem is using depth charges when the subs at periscope depth. WWII depth charges armed at minimum of 50ft. A TYPE VII had a height of about 31.4 ft. Periscope depth for large U-boats is about 60 ft. (all of this per INTERNET and BING Co-Pilot) For a depth charge to rupture a U-Boat hull it has to explode from about 15ft away. So a depth charge can take you out or seriously damage you if you are running at periscope/snorkel depth.
The way Wolfpack is set up you can damage a U-boat and your vessel by hitting it with your escort when it is at periscope depth...but your depth charges can rain like snowflakes on Das Boat but you won't sink it at periscope depth. Unless there is a parameter that I am not aware can be modded. I played with sink rates and damage. Always got the same result attacking a the U-Boat at Periscope depth.

[GMcClellan]

one more parameter to look at is the Depth charge hit %, even if your DC is perfectly aligned, there's only a certain % to hit. That said, I'm looking into this more.

[Tempest5]

To make it more clear I think both vessels should suffer damage of a sorts if DC are detonated too close to the surface.
One vessel that suffered this damage albeit probably in a practice role was USS JUNEAU of the Sullivan Brothers fame. I got that from her log. On her transit through the Panama Canal en route to the Pacific she stopped there to have an oil tank repaired due to depth charge damage (yes this light cruiser carried a small amount of DC's).
I'll look at the parameters you mentioned and get back.

[Tempest5]

I played with the Submarine Hit Probabilities. Increased the values. No Change.