Dave,
For "large blue gills with broad shoulders" I would second the motion for Aquamax 500/600.
Our gills have been on this program for about a year now, and gills in the 9 inch class are common - largest 10 inches - 1 lb 2 oz on digital scale.

Pure coppernose genetics may help - Bob Waldrop of Tyler Fish Farm personally caught and transported wild brood stock from Florida, and hatches his own gills.