A minor tweak and a modest proposal for a partial rework of France, Italy and Britain
Mainly to allow representation to be more faithful the farther back in time we go (in three posts).
The part of Kustrin province circled in red could go to Cottbus, so as to give a land border between Silesia and Northern Lusace. Although it would mess up with the modern German-Polish border. Maybe to Breslau then?
Part 1 - Italy
The revisions for Lombardy, in red - a province of Mantova (it was a Habsburg holding before Brescia), a province of Sondrio (part of the Grey Leagues until the Napoleonic conquest), and revised provinces of Bergamo (or Brescie) and Milano corresponding slightly more to the borders between the duchy of Milan and the Terrafirma's backcountry.
In Firefighter-red, a small suggested tweak to Switzerland, giving the Grisons their southwestern appendage.
The Tuscany, in the same color - I'd do away with Grosseto province altogether - the area was mainly the Republic/Duchy of Siena. Similarly, the province of Siena on your map corresponds mostly to a Fiorentine county which name escapes me for now, and Livorno, in the south, goes too far inland (IMHO), hence the border changes. Note that I put the whole principality of Piombino in Siena province (including Elba - the white line is just badly deleted), mainly because of its exclave on the Sienese coastline.
I'm somewhat torn on Sardinia; Europe is already province heavy, however, the island was, prior to the Aragonese conquest, split in four states. While they were mostly in the orbit of Pisa and Genoa, at least one was directly conquered by Aragon, and part of the northern province was under Pisan influence. The red line is a slightly more faithful representation of the provincial division in the Vicky time period. The purple lines are the 13-15th century borders of Sardinia (the western part of the red line overlaps with the border between Sassari and Orestano).
I don't know if you intend to give more than one province to Cyprus, but couldn't Cyprus give one of it's three to Corsica? Corsica was a bit more populated at game start, and could probably deserve a lumber province... Although I must admit that part of me is just asking for it because I'd like to do a counterfactual in which the corsicans managed to finally obtain independence

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Separately, Savoy
For Savoy itself, if you want it split, maybe go along departmental lines - otherwise, it seems to have been a single province in the kingdom of Sardinia (and it might become a single department within our lifetime). And split that way it can also roughly represent (in a game farther back in the past) the ownership of most of the north by the count-bishops of Geneva.
Aosta, at the time, included Biella. The purple border for Novare is roughly the shape of the province in 1815 - the blue section would include the rest of Savoyese Lombardy, but it would make for a weird province, mainly shaped by the Spanish Succession Wars.
The blue line in Turin province roughly represents the border between Cuneo (south) and Turin (north) provinces IRL (at the time Vicky starts) - besides Saluzzo, however, most of the area was fairly continually the principality of Piedmont.