I've only. Always, ran the tires to oem specs. Would u recommend a different setting?
I recommend adjusting the pressures only if it interests you. Anything between 28 and 45 psi is fine for the tires themselves. In general, lower pressures give more flex and help the tires heat faster on a cold day. (I find the SC2s are nearly worthless when its >=45F. Which is pretty normal for a "summer" tire.)
I generally like the incremental fuel economy of higher range pressures on the streets (and the SC2s grip better
for me at higher pressures as well. Or maybe its all in my head).
For the right oversteer/understeer balance on stock suspension, I understand the FiST likes the rears a few psi (3) less than the fronts. That's where I got the 39 in the rear, b/c I liked 42 front best.
I did 36/36 and 39/36 (this is OEM?) for awhile. 36/36 was noticeably more comfortable but less grippy for me.
TL;DR - Anything between 28 and 45 psi is fine for the tires themselves, feel free to play around if it interests you.