call me crazy but you are just 21 and on your 4th cycle? please tell me you are atleast giving your body a chance to recover off these cycles cuz i dont want to hear your test levels are shot at your age already.
anyways to answer your question.
beast doesn't need to be run more then 4 weeks first and foremost. also if you want to put on mass and strength safely and smartly (which is what you want to do by stating you want to add 30 pounds) then a better cycle would be test + deca + dbol.
test 500/week
deca 400/week
dbol 30mg/day
eat like a horse and you will gain. thats my 2 cents
i am using beast for my next cycle instead of cause i am not so concerned with gaining weight. beast is great for strength in my experience and putting on lean muscle mass, dballs is great for weight which like i said seems like you really want to do.