Great map. Duchy of Parma : I think it's spain influence but it can be debated. OTL don Philip younger brother of Charles III of spain inherits the duchy in 1748.
As he is a boubon, as he speaks french and spanish and as France is closer to Parma, he can also be under france influence.
The asiento in spain was also renewed.
About the west indies, giving guyana and St martin looks good. You can add st barth too : no economic value but it's between the dutch leeward islands. It will cancel a threat over st marteen, saba and st eustatius.
From 1756, st eustatius became the golden rock : neutral in the seven years war, freeport and a great center of contraband.
If netherlands stay ally to britain and didn't stay neutral in a seven years war : no dutch support in the american war of independance. The trade between US and st eustatius is the main reason for the 4th dutch-england war.
French fortification in the southern netherlands can also be limited to charleroi, namur, ostende, ghent and the harbors (already fortified cities). Netherlands will never start a war : with Prussia as ally, the french north border is more peaceful than OTL. The real threat for France is england : the naval development will continue.