I am told by the manufacturer (Gravely) to engage the blades on my Pro G 48 with 15 hp twin Kawi at full throttle to avoid lugging the engine down too far which may cause damage to the engine. It has an electric clutch and I am concerned that engaging at full speed may shorten the life of the clutch etc. Any experience out there? Can you harm the engine by engaging at too low an engine speed? Thanks.