Thanks for the new tables! The bring up a question I've wondered before: why does the gen.pl. *-óoHom not become *-ṓHom the same way * -o-o- becomes *-ō- in thematic subjunctives?
I don't know.
Is there any reason we should think that is doesn't (besides that Ringe lists it that way)?
The reconstruction of the genitive plural isn't so settled anyway. Different sources have different ideas. Look at w:PIE nominals for example.