You simply need to eat more Alcatraz. That's all there really is to it.
I'm 5'8.5" and I weigh 230lbs. Granted, I am not as lean as you, but I'm no fatass. I'll easily make 250lbs within the next year or 2 and with aas I'm confident I'll be able to walk around somewhere between 230-245lbs at 12-15%bf which for me is just fine aesthetically.
HOLY HEART ATTACK BATMAN! Please consider the risks. I have a buddy who's 305 lb @ 6 ft & he tells me his joints SCREAM. Don't play games w/ your health and remember if you have heart issues, steroids will take the blame.