IMO, eat man eat. Make sure you get at least your bodyweight in grams of protein and eat everything else under the kitchen sink. You dont need to worry about gaining too much fat...because you should be able to burn it off easily with you high metabolism. You could also focus on the lower rep range in your routined. Example. 4sets/Reps...8,6,4,2. Theres a good site for watching your calories its called fitday.com. Based on your weight, aim for 4000-5000cals per day.