fore aft saddle position has long been a puzzler for me. ive tried kops with so so results so for me its been 1) adjust seat height by lemond formula 2) try KOPS and adjust as necessary. i make adjustments based on saddle feel. if it feels like its chaffing, i know the wide part of the side is pushed to far forward. if it feels like im sitting on a broomstick i know its pushed back too far back. ive found it helpful to use the same saddle if you have multiple bikes. i only use specialized romin evos now and have found that saddle 3 inches behind the bottom bracket is my perfect number. from there i adjust stem length and height depending on my fitness at the time. a little less bendy after a few weeks in winter, i might use a shorter, taller stem for a bit.