Hey buddy, so 15 lbs of muscle is a lot of muscle. its going to take you more than one cycle and probably a good amount of time. Of course it all depends on how good your training and diet plan are and in the early stages, you will make your best/fastest progress. But keep in mind, this is a long term game. You want to stay healthy so you can keep doing this for your whole life. That said, a good oil based injectable steroid is the safest route to go for your overall health. You’re not going to be able to build a big in shape physique while staying in good health, if you build this on a foundation of orals. Also, I want to point out that estrogen can close growth plates. It’s possible that steroids, which increase estrogen, can prematurely stop growth. That doesn’t only include height but also includes bones that will determine how wide your shoulders are. If you think about what a 5'10, 16 yr old looks like compared to a 5'10 25 yr old, you can see a difference in how wide and thick they look right? Thats due to bone growth that doesn't stop until you are 21-22. So don't sell yourself short in that respect. All of this said, it sounds like you know my suggestions for a test cycle and how I would lay it out. If you want to stick to an oral only, I would suggest Anavar. One reason is that it doesn't convert to estrogen. This may help you avoid the growth issue. I can't promise but it may help. Also, its mild in side effects. Its a hell of a drug and will help produce some solid gains in real muscle as well as strength but sides are low. You will still need to do PCT. 50mg Var, split into 2 doses a day, taken every day for 8 wks. Then right after, 100mg Clomid for 1 wk. Followed by 50mg Clomid for 14 days. Then you want to take off the length of the cycle plus PCT, meaning take 11-12 wks off before starting again.