I can't really understand why you keep saying that the fleet boats were so much better than the german boats. You're wrong. Perhaps the radar is something the germans would have liked though.
Then why did both the americans and the russians copy german technollogy in every way after the war? Here, let me show you something:
http://www.richard-seaman.com/Wallpa...egreesLeft.jpg
http://www.fas.org/nuke/guide/russia...9-farmr_p4.jpg
These pictures show the russian MIG and the american Sabre Jet which were used in the korean war. Do you think they look similar to each other? They were copies of german technollogy. Without german rocket technollogy, the americans wouldn't have been able to reach the moon in 1969! The type XXI submarine was copied by the americans and russians after the war. The allies were stunned by the german superior technollogy. When the americans captured U-505, they knew they were far behind. You know I'm right!
But the germans had never heard the word "mass produce" before. They always had to come up with something new.