In fact, it strikes me that your classification kind of omits the centre of England entirely, which is somewhat ironic when you consider that that constitutes the most important regions.
Their classification, strictly: I suggested it because they'd probably done a reasonable amount of playtesting on their boundaries, and because there were three regions left over to tweak it. To be fair to Paradox, it's not easy to draw coherent regions in the Midlands in any time period: I've done reworked Cardwell/Sandys reforms which are just as difficult.
Warwick, Lincoln, Gloucester and the Welsh Marches works slightly better because it's four regions rather than two, but still has problems. The close proximity of Warwick, Gloucester and the Marches; whether Oxfordshire is included in Warwickshire or folded into Middlesex/London with which it has strong cultural links; Lincoln presumably remains a nebulous entity which rather uncomfortably includes Nottingham, Derbyshire and Leicester; then there's the unanswered question of how far East Anglia extends out- to Northamptonshire and Lincolnshire, as it did when they created the Royal Anglian regiment, or something more modest. Basically, wherever the line goes causes problems.
I would suggest turning The Cinque Ports into Canterbury so that you get another Ecclesiastical province, but then you lose a major trade node, and England didn't exactly have many of them in that period. So maybe instead make York an ecclesiastical province? It's a little bit of a fudge, but it kind of works.
It doesn't seem quite right, to be honest. The big two ecclesiastical centres of England have always been York and Canterbury (in the latter's case, since before there was an England): overlooking that is kind of like making London a trade node rather than a capital. Furthermore, two northern ecclesiastical provinces (York and Durham) unbalances the map. On the trade front, wool was the most critical export in the period: East Anglia represents the network of towns like Norwich, Ipswich, Thetford, etc., exporting to the Low Countries and Wessex represents the network of Southampton, Portsmouth and Winchester exporting to France and beyond.
