Bad frequency response in Hornresp when Keele's expansion applied to Unity project

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I'm on my way to design Unity horn for PA purposes (60x40, BMS 4550 and Faital 6FE200, covering from around 250 Hz, crossed about 1 kHz, DSP processed).

I came across a problem when simulating mids response in Hornresp: frequency response looks much worse when I use the second flare.

Here are my inputs and simulated frequency response with the second flare:
DB9VOs.jpg

E8xKhR.jpg


And here without the second flare:
FS43wt.jpg

eptMGM.jpg

Any idea why does it looks like that? I've read most of the threads about Unity/Synergy designs but never saw any report about that kind of problem.
 
You're right! I assumed, that leaving '1' in the second flare setting in SynergyCalc spreadsheet will just omit the flare, leaving the rest of horn unchanged.
That's great that I know the reason now, but how can I solve that? How can I calculate the proper depth, if I already have my coverage pattern set? Also, I have plenty of space in the rear of horn to use.
 
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