How are you controlling the reactor? In particular, how are you controlling the pH of the reactor, and how are you controlling the flow rate? Those are obviously key as you try to dial in the reactor.
Also...you should measure the alk output of the reactor as a measure of the effectiveness of your adjustments. (use 1/2 normal sample size and double your result because you could be looking at Alk as high as 30dkh.) Don't assume that higher flow rate means more Alk/Ca contribution. Lower pH most often increases output, but there is a limit to how low you can go before the media just turns to mush and plugs up the reactor.
Alk measurement x flow rate = reactor output.
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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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