Agreed the upper back and rear dekts can handle an absurd amount of appropriate training. Vince they basically are what will keep your posture straight. Try training them more often with high volume. You could even do some band pull aparts with a light weight band at high reps every day even...
Can you give us a bit more info age/weight more specifics to your training/nutrition? What kind of progress have you made? How long have you been stuck? Btw welcome to the forum
The guys are right, as long as your using progressive overload(remember that doesn’t just mean weight on the bar), and a diet that matches your goals, you’ll make gains. Idk what the beast body plan is or what your goal is to throw out some ideas to change it up and break the plateau you sound...
No one is going to recommend running an oral more than six weeks. Orals have the c17aa attachment which makes them very toxic. I also believe the injectable winstrol still has this attachment as well.
Once a day is fine, but I’ve split it half in the AM and half a bit b4 a workout. Maybe it was just a placebo effect in dosing b4 a workout was very effective. I workout at night.