I am familiar with your opinion of the JBL 4429. I read your thread before I ordered my 29s, but I also heard them at the dealers, so I had to make up my mind based purely on my own ears. I listened for any sign of the honk/nasal effect you described with male vocals and could not hear anything like that. What I heard was a very natural midrange presentation; some might even call it slightly warmish. Male vocals sounded as good as I have ever heard them. Overall for me, the 4429 sounded nicely balanced, very dynamic, open, fast and completely non fatiguing. And they sure do scale...
I now have about 35 hours on my 4429s. I use a mid spec LP12/52/250/Fraim into them, and it all sounds wonderful together. I have roughly the same midrange presentation as at the dealers, with an overall balance that I think is ideal. I have been keeping a Rel S3 just in case, but the 29s are now to the point where the sub will be up for sale or repurposed in our other system. I am amazed at how percussion is handled by the 4429s; it's like having the drum set right in front of you (I sit only 7 feet back). Also, the best bass performance I've heard. Listening to the great Jazz drummers and bassists is a whole new experience for me with the 29s.
As for the honk, I haven't heard anything like that, so I feel it's a non issue. I obviously respect your observations, but they were made with your ears, so I have to chalk it up to that. We all hear differently, to state the obvious, so you had to find another solution.
On the other hand, I think I have found my lifetime speaker.
BB