Centering the Saddles 17" from fret 12 is the right method for bridge placement with a 34" scale.
There is a LOT of science in where the pickups "belong" based on the frequency your after and the wave pattern of the string.
But the reality is your not gonna hate it anywhere in between the bridge and neck. You may wish it has more high end or low end responce. In which case you would want to move it back or forward.
It is safest to put it where the mig guys do as they definitely researched the science behind the placement, and also did a lot of R&D and Trial and error that you dont necessarily want to.
I built a mule just so I can try different pickups I build in different positions.