Here's what I am going to try next after a re install. I chose to go with the enhanced sh5 TDC in TheDarkWraiths new UI. I hope it works as there are some conflicts but I don't know which ones are harmless and which ones are not.
Update! whilst talking to my crew on the way out of Wilhelmshaven to raise their moral I got a CTD, I was about to talk to the gunner in the rear torpedo compartment.