Well a verdict. The meat (what VERY little of it there was) was quite nice and very tasty. Smoke was very good and deeply flavored. The veg I placed in there I am sure flavored the beef somewhat and the sauce but re eating them........................meh. I think they picked up so much it would have been better had I simply blended all the veg matter into the sauce and done a separate roux and made a thicker actual "gravy". But, as large as these were, there was only a couple mouthfuls of actual meat.
So I think the method would have been better on perhaps some of those smaller shortribs you might find packaged in a grocery store. Or maybe with shanks instead.
Anyway there are seeds of ideas here. Not sure how far I will take the ideas, maybe someone else will want to pick up where I left off. But re oxtails I will only use them for soups from now on.