Gradually apply power until catenary almost breaks the water, but keep the catenary in the water.

If the towline is properly adjusted and weighted you can order slow or dead slow and the towline will act as a spring to absorb the initial shock.

Order minimum turns until the towing hawser is just clear of the water, then reduce speed to that necessary to keep the line clear of the water.

Order minimum turns until the towing hawser is taut and then continue at that speed until towing speed is attained.