I'm almost sure the amount of DCs is limited. I sometimes noticed they were making attack runs on me without dropping any charges at all. This only occurred after they pounded me for a while so I guess they run out of charges but their AI does not take this into account. So not only the DCs seem to be limited the AI is too...
Im using RUb 1.44 (and patch 1.4b) but I don't think it makes a difference concerning the amount of DCs.
Mr. Fleck