16% at 177? IMO you need to spend a few years getting your diet and routine dialed in before you mess with drugs.
I'm a complete DORK when it comes to testing (I do R&D/development for a living). When I started lifting I DEVOURED every bit of diet/training information in site, put it in my "toolbox", and then got to testing. It took me a solid two years to figure out what worked best for my body. Two years my man. Two years of constant testing. And it's fair to say not very many people dork out like I do. I hate to be harsh, but if you think you understand your body even 20% you're wrong. And you shouldn't be adding a huge variable like drugs until you have a much better understanding. Because guess what happens when you add drugs? You get a bucketload of new variables. More variables that you're not ready for.