When you do figure it out, try to set your 'liking' in the middle of range if possible. That way if you need to make adjustments, as it wears / ages, as your weight changes (holiday fatass syndrome
) etc, you can tick it in and out as necessary.
yes only 10 to 15 lbs CAN make a difference when riding for optimal performance on a bike.
also, if you are working on a race bike, or for higher performing situations, if you are sitting on the bike to see what your tonnage does to deflect the shocks, make sure you are dressed as you would normally be dressed to ride the bike to make the measurements. Meaning if you are racing the bike, make sure you have your entire set of leathers on, helmet, gloves, boots, armor inserted etc. when checking it, because YES that shit DOES get heavy. I think I last weighed my setup at about 22 lbs or so. 22 lbs is enough that you very possibly may need to notch a spring adjustment etc. If you are going thru this trouble, make sure you do it absolutely right, for the absolute best results.
Just saying.
Aaron