20 pounds in a month is not going to happen on an oral only cycle IMO unless you are pretty damn lucky, so don't worry about that.
Why Andriol? Its not active in the system for very long, not a 17aa, but I'd rather do something else.
DBol works great for fast action (your short cycle plan).
Why no injectables? Unless you have baldness in your family, your being overly paranoid.
I think I'd take a small stack with injectables and plan on 20 pounds over 2 months if you don't want 25-30 that most people keep on an 8-10 week cycle, with proper use and post cycle therapy.