I agree that the 55 in/lb seems very low. Although the normal torque on a 1″ nut would be in the 200 ft/lb range these nuts are tightening through a fiberglass stringer. I think at that torque you’d start to crush the stringer. Last time I did mine I used the very un-scientific tighten ’em until they feel okay method. They’re still tight several years later.