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I just did a quick calculation to assess the benefit of 125% “asymetrical” modulation. My conclusion is don’t bother. Details upon request, but based on what I calculated there will be no significant range gain and even if I am wrong about a supposed range difference, the distortion price paid appears to not be worth any effort.
The biggest gains in range under the contraints of 15.219 are to be had by improving on the efficiency of the transmitters, and not by distortion of modulation to achieve artificial modulation percentages. How much is gained by an increase of range of a few hundred feet?
Just my informed opinion, open for debate, for your consideration.