Brian, yes same sizes for me too. On the Cayman, I got best results with the R888s around 34 psi. I think your 10-12 psi gain was due to them being new, I expect similar gains first one or two days, but third day it shouldn't be more than 6-7 psi. I'll be slow first few days, no worries.
I am looking forward to seeing you run on Hohos, that's going to be something to watch
Cheers,