no it is not possibly to put on 15lbs of solid muslce in 6 weeks.
and I dont want to turn into a ranting pissed off person, so i'll keep this short.
I dont think you (the op) should ever use steroids again. methylated, or not.
yes, you are a big ass dude. okay. but from your post, i feel you needto work on diet and training, and combing the two to work effectively towards your goal.
people think steroids are a short cut. and use them as such.
but they arent.
it is people like this that give gym rats that actually put in hours in the gym, and work hard on figuring out the perfect micro/macro nutrient intake for optimal results a bad image.
no funny take the edge off humor for you.