Your pH probably goes up and down in a daily cycle. Measure it right before your lights come on and I expect you will get a much higher reading. I don't think you should be attempting to do anything with your pH and I suggest that you stop adding that buffer (assuming this is the only reason you are doing it).
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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