S2 Point Source prototype #2 - evaluation

My second point source horn prototype (S2) sounds very good, but I would like the mids to extend higher. Here is the measurement compared to the hornresp sim:

As with the previous horn (S1), the peak is bigger at 300 Hz, and extends a little lower than expected, -3 dB @ 210 Hz, not 230 Hz as predicted. Top end roll off begins at 900 Hz (-3 dB) not 1.2k. 

Hornresp input for S2 as built: