I am not convinced that PB is accurate enough to reproduce, in a small sample of a 160 game schedule, park effects. I have had numerous players that underperform or overperform in any given season. I look at raw data, especially OBP and SLG, to value hitters. I don't worry about park effects. (Except for the extreme park like Coors...hitters here hammer pitchers, even good pitchers, to the max.)
As to pitchers, I also am not sure. Colorado pitchers often have higher PB Grades/Clutch ratings than their ERA's would suggest, but I don't know if they perform that good in PB.