I'd have to say this to you bud, go visit the clean bulking section in the Nutrition Forum. Says in there what to do, I'd have to say add more fats, good fats to eat. More protein, just a 'tad' bit more, say 160 grams or protein, bulk up more on carbs.

Need a little bit more info on what you eat, amount of calories/carbs/fats, and ect,.