I respool my reels often since they are used so much. I try to put a comparable amount on each reel, around 850 feet of 12 pound Trilene Big Game, to start. ( I buy the 4700 YARD spools of Trilene). At the beginning of a new cranking season, I change all the line on my reels with no backing. Once I've used a reel a while and the line amount has dropped due to break offs or twisting, I'll take off an amount about 1/2 the amount of the spool then tie new line onto the old as a backing and respool. I'm not the type of guy who is anal enough to calibrate each reel amount of line. If I let out 80 feet of line with a Pico INT and catch a crappie, my next drop is going to be 80 feet. I think duplicating the amount of line each time is good enough when the fish are biting. I do set up my spread with each rod on the transom with a different amount of line until the fish tell us what color, pattern, and depth we need to be putting our other baits. Fishing is stressful enough when one guides clients. Keeping it as simple as possible has worked pretty good for me.