I agree with the above posts stating " if you let out the line too fast you will get tangled" , think of it this way, the dipsey is designed to pull down and away, if it drops too fast it will fall straight down and as it falls it rotates like a spinner blade.
Few thoughts.
1- when i let out mine i do not let the line scream, i can hear individual drag clicks, if using a mag perhaps a little thumb action is required
2- when setting up in heavy seas put the waves to your back making the waves 90% less of a headache and hold the rod in your hand to stop the surging of the waves pushing you forward from putting slack as you are dropping it back.
3- watch your turns, in heavy seas your inside rod can literally loose all its tension and then you are in to another dipsey falling like a spinner blade; so turn slow
4- if a quick turn is required speed up the boat to compensate even if the outide rod is doing 5mph at least you will have tension on your inside rod to avoid free fall
5- when using agitators/flashers/dodgers or SD's they have a extra drag in the water, you have to drop extra slow to allow them to trail the dipsy horizontally instead of rotating vertically and catching your mainline.
just brainstorming