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The vacuum doesn't allow for the influence of spin, as well.
Optimum launch angles have changed in golf over the last 30 years.  In my experience, it used to be that a boring trajectory produced the longest shot.  The ball used to spin more off the driver so balls launched with high trajectories tended to just balloon. 
Today, the ball is designed to spin less off the driver but more off of irons, where you want spin to stop the ball on the greens. Balls launched with the higher trajectory with the driver now carry more and ballon less.
It was on that experience that I thought almost all homers would fall into a seemingly narrow trajectory window.
Very interesting that it is the most "moon-like" or "vacuum-like" park in the majors that rewards the highest launch angles.
I've played most of my golf life in "coastal air."  Inland there is a difference.   Not only on the coast are you likely at a lower altitude (more air) but it tends to be cooler and denser for much of the day/year.  Especially mornings and evenings.
I'm willing to bet that were it really closely studied you would find an impact of tides, in fact.  Huge amounts of air move in and out with the tides. Esoteric stuff, I know.  But I bet it could be measured.
Honest to flippin' goodness, is there another baseball site that does this kind of stuff?  You guys are too great!  I think I will name my first born male child after all you guys.  Good old DocGMojMattDaddyPhxBat his buddies will call him.  The kid will clearly have issues. But then none of his 3rd grade friends will know what in the heck BABIP is, either.  Losers he will call them.
moe