I'm a bigger guy too at 6'4" an 230 (need to drop about 15 lbs of gut butter) but when I used to lift heavy I noticed that it adversely affected my hiking. Muscle is heavy and while some is good, too much is just extra weight your frame needs to carry around. At some point it becomes a matter of diminishing returns.. I need more muscle to carry the more muscle I have. Also too much muscle will constantly be burning more calories causing you to carry more calories for recovery.