Hi Simon,
Although I have not looked into this for the late war boats in any depth, I do believe they were the same as the early boats. In other words, some had the evenly-spaced arrangement and others the paired arrangement. At a rough guess I'd say there were more paired than evenly-spaced but it would take time to analyse this for accurate figures.
I think U 1305 had the paired arrangement. I'm not 100% certain but maybe you could look into that if possible. It is not always that obvious to see the paired arrangement and it often only becomes apparent if one careful looks for it in photos.
Note also that every boat was slightly different. The holes would be cut by hand so dockyard workers would vary in terms of how "paired" they would be.
There was also differences between the pattern on either side.
If you need more info just shout.
Cheers,
Dougie
PS Glad to hear about Mr Tore