Why larger carriers do not immediately restore naval control of British aviation

Would larger and more numerous carriers return the Fleet Air Arm to Royal Navy control earlier?

Probably not; the 1918 decision arose before the treaty divergence, and the transfer back would likely still wait for the 1937 Inskip decision.

The alternate treaty can make carriers more central to fleet operations, which gives the Admiralty stronger evidence for regaining control. It does not change the wartime political logic that combined the Royal Flying Corps and Royal Naval Air Service into the RAF. That earlier institutional choice remains outside the counterfactual's point of departure. The navy may campaign harder, but the formal return would probably not happen appreciably earlier.