The short answer is I agree with rdr that we should be hunting on the HR wagon. I think it's much much harder to hunt without any known scum, so let's find one.
To answer your implied question about my opinion of those three:
rdr seems towny to me (NOT for mechanical reasons...I think his vanilla character is NAI), because I find myself wanting to make every post he does; they're very thoughtful and open.
kgray and bo are hard for me to read in general, so my default is to always have a slight scum-lean on them. Some additions:
Of the kgray/chaqa fight today, I think Chaqa is the scummier of the two (but Chaqa is ALWAYS crazy and scummy).
Of the kgray/ghug "fight" (he seems to just be pushing her for reads), I think ghug is townier.
I have not been annoying kgray as much this game, but that has been a conscious decision after publicly apologizing last game. That said, I don't find her posts compelling, I just have trouble making a read on that. Her confusion with my posts is possibly a scum tell, she may be gaslighting me for revenge.
Is there something to say about bo? No? He harassed me for wondering where you were Day 1? Yeah...that's a bit scummy in itself. But not enough for any actual read.
tldr; Of the three you asked about
Townier
rdr
bo
kgray
scummier
but bo and kgray are closer to the null end of scummier.