I'm 5'6" and weigh 235, and am a lifter, not a bodybuilder. I think the distinction is the important factor, trying to "bodybuild" tends to punctuate sections of the body and often misses the systemic stimulation you need to gain mass. maybe, you should forgo the frankenstein methods and do some real lifting, heavy weights, 1,2 and 3 reps for 3-7 sets, heavy overhead presses, deadlifts, bottom postion benches followed by powersnatches, powerclean'n'pushpress, these are the systemic exercises that will punch your metabolism up and bring on the extra muscle you want.