Started working further on replacing basic melodies with 7th chords and it is true they quickly sound believably jazz but also quickly unmysterious. How to suggest the melody without also sounding like a coffee with five tablespoons of sugar. I like Erroll Garner’s left hand method, clanging quarter notes in his left hand as if he is a guitarist. Especially like him because he was small like me, he even sat on phone books. But the thing is he was as speedy gonzales as any of those monsters with 10ths or 11ths in their hands. He had other inventive solutions working just as well. Nobody small can complain. You just work a different angle.