Under what specific circumstance might an angler need to increase trolling speeds to between 15 and 18 knots when fishing for wahoo?

In competitive situations when tracking migratory routes

Trolling speed is highly situational and must be adapted to the specific fishing environment. When anglers are tracking schools of wahoo along migratory routes, such as during seasonal peaks in the Bahamas, high-speed trolling is often necessary to effectively cover large amounts of water and trigger strikes from aggressive fish. Speeds of 15 to 18 knots are frequently employed in these scenarios. This is in sharp contrast to live baiting near structure like oil rigs, where much slower speeds are required to keep the bait in the strike zone and ensure the presentation is enticing to the fish.