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Coors field adds about 7% to the average HR distance...so say the physics experts who have modeled it.
So, let's see here...of the 8 HRs he hit at Coors Field in 2009, the corrected distances for an AVERAGE park would be (ordered by true distance):
416
413
402
400
386
368
364
360
Now...his other HRs were hit at Chase Field (another launching pad with about a 4-5% distance correction required to account for very thin air despite not as high altitude), Wrigley Field (no distance correction needed), Angel Stadium (a 1-2% distance correction), Great American Ballpark (no correction), McAfee, Comerica and PETCO (all required a correction UPWARD in the neighborhood of 2%, 1% and 4% respectively (I'm estimating the smaller corrections based on comparing average air densities at those locations to climatological average for the whole USA).
The adjust road HRs now look like (again, in order of true distance from Hit Tracker):
445
422
413
406
404
391
398
Meaning his context-adjusted average HR distance is NOT 410+...it's actually more like 400 feet (399.2).
His average HR distance at Safeco would be about 380 feet applying a 5% downward correction.  Yes, even the lefties still have to contend with denser air.  with his distribution of balls to right and right center, I estimate he'd lose about 3 HRs at Safeco in the RCF gap and probably a few doubles too.