Plateau or ceiling? Can't move up Master ranks any farther!

[jaxxinjr]

Maybe consider this a request for advanced tips.

I first placed in gifted, quickly moved into master, but cannot advance past #5-10 in my master league for the last hundred or so wins. I study my replays and forum replays, including supertitan matches.

Few issues I see with my game:
Still cannot master a map or two (I usually dominate small maps but can struggle with wide open maps).
Still play mostly round by round versus seeing many moves ahead with a long-term strategy.
Probably too defensive versus smartly hard charging.

Any tips on breaking through? Any advanced techniques that I must learn?