The main trouble with full sail is that the manoeuvre station for a 74 for tacking under full easy sail is 299 men, while the manoeuvre station in action starts at 117 on gaillards aft and forward, the dunette and the men in the misaine, grand and l'artimon hunes. (QD, FC, RH and fore, main and mizzen tops).
(Strictly the men in the tops are both boatswains and marine soldiers, roughly half and half of the 25 men aloft, but these soldiers have stations aloft in the manoeuvre station bill too).

When fighting both boards the gun crews are augmented with men from the manoeuvre and musketry (musketry is reduced to only those soldiers in the tops, while manoeuvring is reduced to 84 (again including both soldiers and boatswains as topmen).

Manoeuvre can be augmented by mustering manoeuvre stations from the guns crews, but this takes additional time and will reduce gunnery rates of fire for longer than the manoeuvre will take, and will delay starting the manoeuvre as the additional men are mustered and distributed to their stations.

It makes more sense to operate with reduced sail to reduce the number of men needed to operate the rig, and the fewer lines in active use the less congestion on the weather decks and castles, and the less interference with the gunnery from manoeuvring teams and the less interference with manoeuvring from the prosecution of gunnery.