From memory, 'Wings on my sleeve', by Cpt Eric 'Winkle' Brown has quite a bit of stuff about the various craft he flew during his time in Germany post WWII:
It may perhaps be a bit too detailed for what you are looking for, i.e. describing the actual flying and his experiences rather than the overall strategy for assimilation of German technology, but it's still a good read from the perspective of somebody who was there at the time.
Regards
James