I have a 30 pound Turkey (feeding 15) and it's browning faster than I think it should. I've covered it in Aluminum Foil and lowered the temperature, can I do anything else to slow down the browning?
Sounds like you've done all the right things.
You may want to take the foil off for the last 30 minutes of cooking, to crisp up the skin. I can't think of anything other than foil tenting though.