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You're using a phase plug?  Why?  To try to get it to go higher? 
If using parallel drivers, and doubling Sd, it may be necessary to change throat area to not damage drivers... 

The third design type sounds quite different from the first two. 
In my opinion, so much better I've quit messing with the first two... 
Have you heard both type horns? 

"Compound Horn" is what I've heard many speakers with horns on both sides of the driver called... 
e.g. what I mentioned previously, & linked, what I've built,... 

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