I'm still new to this but in my opinion I believe you have some serious reading to do Germ. Feel free to correct me, anyone for that matter, but 20 weeks is pretty long on a body that's new to injections. Also there's a sticky up top that shows a study between 300mg vs 600mg, the 600mg had better results. Even at 20 weeks, think of when your next cycle would be. Could you really wait another 20 weeks + pct for your second cycle? Also you've stated that you wanted to run a 500mg followed by a 600mg, you can find threads where people run only "beginner" cycles and still make gains. Seems like everyone's first cycle provides the most gains. Remember that you're only 25ish, life is not a sprint.