The humidity is super suspect. With what you measured, you're actually only removing 14,000 btu/hr. (the moisture is adding heat) I actually ran the numbers 4 times, in 2 different apps as I thought that I was making a mistake.I see your dialogue with Beenthere, but I don't fully understand. Which measurement is suspect? The supply 86% RH? I am not sure how to improve that one,please see my response to Beenthere regarding measurement methodology. It is definitely higher than return though, is that an issue?
Any other measurements suspect? I think I did a reasonable measurement on the rest but I will re-measure anything questionable. Clarification on "something is wrong" would be greatly appreciated.
With the performance data beenthere posted, and the conditioned you mentioned, you should be moving north of 40,000 btu/hr. The sensible heat removed should be around 28,000 btu/hr. (temp measurement only)
Conditions greatly effect the capacity.
Try measuring the temp and humidity right at the air handler intake. If there's a filter, remove it to give you access.
PS. MBH stands for thousands of BTUs per hour.
PPS. The heat rise method is accurate when measured carefully.