I think the problem with Angevin/French pods is that the North (outside Flanders) is worth less economically in a feudal system than the South. So Angevin kings holding Aquitaine will defend that more than Normandy.
The solution is not have Aquitaine in the first place so any expansion on the continent is along the coast and easier to integrate.
The solution is not have Aquitaine in the first place so any expansion on the continent is along the coast and easier to integrate.