I don't worry about tiller measurements, I tiller for equal limb timing by keeping my trees pull rope traveling straight down the black line on my tree that is positioned where my middle finger will be when shooting the bow, and whatever the tiller is, that's "what that bow wants."
A lot of guys don't understand that or care not to consider it.
The bottom limb is stronger because it's shorter than the top limb by 1.5", reason being is the center of the riser is 3/4" below bows center.. That makes my arrow shelf 1.25" above bows center. The closer you get the arrow shelf to the center of the bow, the more you are drawing the bow at it's center, "bows static pivot point".
There was a thread in here a long time ago, polling guys as to how far above the bows center they placed their arrow shelf.
The majority said 1.25" above center.
Have more plowing to do... Light snow falling:)