My father has a "scholarly" machzor, which
has the original text of Melech Elyon. Basically, instead of what we have, which is a bunch of Melech Elyons with an ending of two Melech Evyons followed by one final Melech Elyon, the original had about twice as many stanzas, and a good many more Melech Evyons. The original alternated between these Melech Elyons and Melech Evyons throughout.
My guess is that they stopped this practice because the guy who got peticha began to develop carpal tunnel syndrome.