here's one for you:
Last winter, I put the axe to a bunch of roosters. In order of most impressive carcass quality:
Black Laced Red Cornish
White Laced Red Cornish
Blue Laced Red Cornish
Cornish x Show Q Ameraucana
Cornish x silkie
then distantely a bunch of 'farm king' dual purpose roosters...
Sad, but true-- the silkie crosses smoked the farm king 'dual purpose' roosters who were on average 2.5 months older.
May I see some pictures of your Cornish crosses you mention above? They are very interesting, had wanted to try those crosses you mention up there. I have some true Ameraucana already and a few large fowl silkie meat types birds, not the little bantam fluffy balls many seems to raise. Now I just need some LF cornish birds to play with.