Curiouser and curiouser. Did you calibrate the KLH the same way, or is there a chance that it was calibrated "by ear" and in fact was running at a significantly higher level ?

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8