Coming back to the OP's original question, I just try to get a feeling of natural balance on my bike. When I'm riding along at tempo, do I feel like I'm propping myself up on my arms? Maybe I'm too far forward? Or does the steering feel a bit vague and nervous? Maybe I'm sat too far rearward. Am I constantly looking to shuffle forward or backward on the saddle? Or am I content sat right in the sweet spot of the saddle? These are the sort of things I think about when setting up my bike. I don't even measure KOPS or saddle setback, except maybe the latter just to get a reference if I change my bike. As I mentioned earlier, I'm not particularly sensitive to saddle fore-aft anyway.