I used your instructions to roast our 22 week old roo I butchered last week. Gave him a few days rest in the fridge first. I'll admit he came out of the oven quite juicy, but I'm afraid the heritage bird thing is just not for us! I guess 40 years of eating the supermarket birds has us liking the bland cornish cross. This bird had a lot of flavor - a bit too much! I told my husband it was like an entirely different bird. He was very unhappy with it, but at least he gave it a fair shot.
I'm glad I found out now, before I ordered straight run BO for my spring chicks. I think I'm going to go with pullets for the BOs, and try raising some CX and see how we like those for meat. This bird won't go to waste though, I saved what was left for stock. I'm betting he'll make fantastic stock!