Without knowing anything but what I'm reading here, I suspect your problem may be mental more than anything else. Sounds like you have trouble committing and then flame out. The overhangs you mention as problematic are all very different-- the Drunkard's roof is a straightforward overhanging jug haul but Maria and Tequila Mockingbird are more puzzles involving roof avoidance than true roof pulls. But in all these situations if you are paralyzed you won't make it.
It's true, I have a blog. http://climbandpunishment.blogspot.com/