Too many dual encounters?

[pampanito]

I have been transcribing the KTB of my past career, and have noticed a substantial number of independent ship encounters are composed of two vessels. To be specific, five dual contacts out of a total of fifteen, a 33%!
Perhaps that is too many? I have seldom heard of such dual-encounters in the real u-boat war.

If anyone could take a look at his own independent contacts, it could confirm if I simply had some lucky sightings in a row, or if the frequency of these dual contacts should be toned down.

I'm using RuB and the latest Improved Convoys.