Don't even ask me what the impedance curves looked at for any of these speakers. I haven't the foggiest. Used to pay attention to such things. Then I realized impedance curves, like frequency response and all the rest, are at best second derivatives. In other words there is the final result, what you hear, and then there are all the things that go into that. The sound you hear is derived from sensitivity, dispersion, impedance, etc. They are not what you want. They are only things we have learned to measure and derive from what really counts, the sound we get.
Now considering you are having problems I have never had in 30 years you might want to stop and think about it. If a guy has never had a problem in 30 years, always picked great satisfying speakers, what is he doing? How is he doing this? It ain't by looking at curves on charts.
The only measurement you need is sensitivity greater than 90. Then from there you pay attention to listening impressions. Then when you find people describing a sound that matches what you like look for people who are hearing that sound with tube amps.
This takes no more time than searching through impedance charts. Its no more easy to describe the sound than measure the impedance. Look how many times JA and others go into excruciating detail about the technical aspects of impedance. Then at best all you have is one more extremely crude measure of performance. It tells you nothing about how deep and wide and inviting the sound stage will be.
But on the other hand, maybe you don't care about such things as musical involvement. Maybe you do only care about tiny little technical details like how tight the bass is between 146.9 and 237.8 Hz. If so then, as Roseanne Rosanna Danna used to say, never mind.