So are there any hidden sources for the Driedaagse Zeeslag?

From a search of the obvious sources at the Nationaal Archief in The Hague, it seems that there are no sources that give details about the Dutch ships or fleet in the Battle of Portland (early 1653), or as the Dutch call it, the Driedaagse Zeeslag. My question is if there are some sources either in private hands or in places that we have not though to look? We have Dr. Ballhausen's book, but what he has seems to be speculative, at best. I even think that his map might be incorrect. We have really good information from April to October 1653. There are good fleet lists and ship data for that period. The data for the Battle of Dungeness is adequate, but I don't have all the details that I would like. There is also said to be good data for the Battle of the Kentish Knock, such as the reports given to Witte de With after the battle, but I don't have those.