Thank you for your report rudewarrior.
Hopefully, when each new DC / DC dropping mechanism will have its own model, it will be a lot easier for us telling wether a certain upgrade has been applied when supposed. Talking about start/end dates though, we should keep in mind that the ones set in eqp and sns files seem to be randomized in game, as discussed in this thread:
http://www.subsim.com/radioroom/show...11#post2468211