You are 5'7", 205, and you bench press 405 pounds doing sets of 8??!!  I've been a gym rat for over 5 years -- that's absolutely amazing!  Frankly, it's hard to believe .... but since I don't have any "hard-core" evidence, it must be true.  Like because we never saw McGwire shoot up, he never took steroids.  Man, no one has ever been a bigger A's fan than me over the years, but if some honestly think Mac didn't juice they're being unbelievably naive. "Gradual growth?!" Wow. The guy was a skinny kid one year and a monster two summers later.
P.S.  Never saw a hint of acne early in his career. Those who are suggesting "this was always a problem" are misinformed as well.