Thank you PacBlue that is really helpful. Now I just need to better understand what the safety factor really means? In other words, I realize the 5.0 factor is preferred? But if I'm at 4.68 now and never had any issues, how much risk am I taking by dropping down to say 3.56 factor? I don't back hard chasing marlin or have any need to accelerate quickly. I also bring things up to cruise slow and steady. Does that change anything or is the safety factor needed more during cruise, heavy seas and WOT? Maybe the greatest shaft stress is in/out of swells and heavy chop?