Hey Tommy,
I'm Boggy Bottom Bantams, so YEAH! they're bantams, LOL! I think Cy crossed his to Dutch several years back according to a abundant amount of post on the Onagadori Site. Also, I too fully agree that if you want the truly nice ones, you HAVE to buy from good stock. Hatcheries are God only know's what, and like you said are very misinformative on them. You must give them extra babying, and a good diet along with some letuce and such goes a long way.. 2-5 feet is not too uncommon with EXCELLENT genes, hatcheries at times look no different than a normal rooster.
I do have to say though, my phoenix bantams (I dont have any onag's) hardly roost except at night of course, they'll jump up on the poles a little more than most, but usually hop right back off.. The ones I have now can from Travis Anderson and Jim Mellering, but have talked to Toni-Marie and plan to get a good bit color wise off her this year , Lord willing...So hope to have lots of the beautiful little guys running around here before long...