Water vapor is less dense than dry air so the higher the humidity the less oxygen at a given density altitude. I used to know the correction factors when I was flying for a living but can't give you good numbers now.
There are three parameters that affect air density. Barometric pressure is the most significant, temperature is next, and relative humidity is the least. Changes of .1 in hg baro, 2 F temp, and 5% RH will change performance.
I noticed you didn't quote the baro pressure. You really need to gather that info too.
Another thing I noticed is that the dew point was within 7 to 10 F of the temp. That means ~ 100 grains of water vapor in the air. Combustion speed/quality is affected by this amount of water resulting in reduced power. This phenomenon is not documented in the SAE stuff but is practiced by most pro race teams. Back in '92 I was invited to the Gaerty Engine shop north of Indy. Earl has a temp/humidity controled dyno cell. We flogged a $30,000 (in then year dollars) methanol sprint car motor for 2 days to define this condition.