When I was running 15/16" feels mushy because there is more pedal travel which I like. Modulation for me is easier if there is more travel. When I was on 15/16 it is Z32 30MM Iron up fronts and Z32 rears on Carbotech XP12's in the front and XP10's in the rear with brembo blanks all around..
Also FYI the R32 GTR Nismo BMCs are also 15/16 wtih a 498 split point.
https://tfaspeed.com/products/nissan...bs-46010-02u20
Z31 Turbo MC is the same as that GTR BMC spec. Not sure about internals.
My new setup I bought from gills(Core4) front 6 piston Wilwood with Sti Rear with S14 thin booster and same BMC. Hopefully it will feel the same