I have had a little idea in regards to the English roster, perhaps you could add a Huguenot unit? The siege of La Rochelle was in the 1620's and was supported by the Duke of Buckingham (I believe he even tried to land an army although the campaign didn't go well) not to mention the support Elizabeth I gave to Henri IV of France. The Trayned Bandes would be another unit(s) to field, they were sort of the equivalent of the Territorial Army. They were raised on a county basis so you would have regiments of Trayned Bandes for Yorkshire, London, Cornwall etc. Perhaps an Irish unit for the Spanish roster as well? They did send support to the Earl of Tyrone's rebellion against Elizabeth I which ran from 1594 to 1603.