OPS

A general and probably very naive question: using DiamondDope I field ATG hitting lineups which in my home park are 1.000+ OPS against both L and R - I regularly end up with team OPS in the 700's - thoughts?

Your players will likely never match their "projected" results because of two factors:

Ballparks - If you're in a bomber park and you have a bunch of pitchers parks in your league, that will skew your results.
Opposing pithers- There are many more super high quality pitchers in a typical league and half the results are on the pitchers card.