longboard twinzer fin placement

I’ve searched the archives for twinzer fin placement, yet, I cant find out where to put them on a 9’ longboard…

As far as I am concerned , these are the best high performance longboards for me, but I’m gettin old…ACE used to make me twinzers years ago, and know I want to make a 9 ft x221/2 longboard with concave in the nose, pretty much traditional , but as a twinzer, not a quad…quads seem to be tempermental and not as loose as a twinzer. Can anyone give me some basics twinze rsetup distances  for fin placement on a 9 ft longboard ?? Please dont respond with quad vs twinzer crap. I just want some simple placement numbers for twinzers…

this was off a 7’10" step up but heres the #'s

    8.25" up / 1.5" off rail / .25" toe,  about 4 degree of cant

   12.5" up / 2" of rail / 3/8" toe, maybe 8 degree cant

 One thing is for sure, more cant and toe on lead fin.