I have heard back from the PTB at The Make a Death Wish Foundation. He reports that although he doesn't read many plays, he ended mine wanting more.

Which I'm taking to mean that it's not overwritten, yet. Fantastic! I've also sent the fourth draft to TDS (aka Ed), who read an earlier draft and now will read the fourth. Prolly do the same with Illustrious Anne

Gerry, man, if you're lurking: I'm writing this one special, just for you.