Bike fit / correct riding position

Cheers.. just skimming trough the article I get the impression my whole question is wrong.
Instead of listening to my legs I should pay attention to my torso/balance/breathing when deciding seat seatback?
Now I'm thinking that my recent need to move my saddle back might have been instigated by me gradually developing a longer/more stretched out upper body on my road bike. As opposed to any issues with my quads. Cool, will be more mindful of my upperbody on next ride.

A list of personal details you didn't ask for, that I am nevertheless including for no particular reason:

• I've got long legs, just a smidgeon below the upper red line on this chart.
  
• My hamstrings are pretty OK for a bloke nearing 40.
  
• My heel is usually horisontal at 9 o'clock. I've got my seat in the lower section of the recommended height-range in order to achieve this. Fuck pedalling tip-toe like a ballerina.
  
• I ride on the hoods 97% of the time. Admit it, so do you lot. Tops and hoods for a bit of occasional variation maybe, I never ride in the drops.
  
  

EDIT.