The only map I could find of that time was from EU3
http://i.imgur.com/nGA4pkJ.png
Anyhow, my thinking is that by the end of Charles II's reign in the New World, the British Republic and New Albion look something like this: plausible?
http://i.imgur.com/patT4JU.png
Code.
I have a couple comments on your maps:
1) Don't rely on EU3 as a good guide to how things actually were. The game oversimplifies things A LOT. How about using this as a starting place:
http://homepage.usask.ca/~schmutz/1650Map.jpg
2) The main difference between EU3's maps and the reality on the ground in 1650 is that EU3 can't adequately represent how little penetration into the interior there was at the time. There were probably fur trading forts that aren't on the map that I've found, but there was certainly very little actual settlement in the interior, and any European presence in the interior was centered around the major river systems: St. lawrence, Hudson, etc. So, when thinking about expansion, imagine that expansion following the rivers into the interior....
3) In your "end of Charles II's reign" map you have three major conquests that have happened:
a) It looks like New Netherlands and New Sweden have been eliminated. I think that would probably be doable easily with a small increase in the number of English colonists, as neither was a particularly strong colony. Although, you'd also have to think about how this would affect relations with the Netherlands and Sweden. Your New Albion would probably be relying on trade with at least one European power in order to supply it with manufactured goods. I was thinking the Netherlands would be the most likely ally as they were always more interested in trade with the New World than settlement, and would probably be ok with their colonies being flooded with English-speaking settlers, as long as the Netherlands maintained a trade monopoly with New Netherlands. But, it could as easily be France, Spain or Portugal that's their main European ally.
b) The Haudenosaunee (aka Iroqouis) are gone. Have they been conquered by New Albion or absorbed into it as allies? Conquest would probably be unlikely at the time, as conquering such a territory would be a logistical nightmare for the English, as there were no roads, little cleared land, few forts, etc. The best the English could hope for would be to drive the Haudenosaunee away from the banks of the Hudson and Mohawk rivers and establish some forts on the river bank. Penetration into the interior would require roads, which were nonexistant at the time... I think incorporating them into New Albion as an ally/vassal would be more likely..
c) You have the New Albion controlling the South Bank of the St. Lawrence. The St. Lawrence was core French territory at the time, and I doubt that the colonies would be able to build an equip a large enough fleet to launch a naval assault on Quebec City and then Montreal. A land campaign could be possible via the Hudson River and Lake Champlain, although it would likely be again a logistical nightmare due to the lack of roads. I think if a conquest of any part of New France is to occur, it would have to happen via first taking Acadia as it worked out in OTL.