Sometimes it is not very intuitive but small changes <1cm to saddle position can really effect how your balanced on the bike. Throw off the balance and you end up with pressure on your back or your arms. Small change to height and next thing you know you have knee problems. I probably spend at least a week tweaking a new saddle even when I set it exactly as the old one was. Then of course you can still have days where you ride and find your knees, back or arms sore. I always wait to make sure that it happens on multiple days before I make any changes. Of course this makes for some tough rides if your hurting
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The problem with the gene pool is that there is no lifeguard and the shallow end is much too large
2013 Noah RS