Hopefully you know about the Dog Leg and the Lizard tail....
Do you have any other "special curves" you find yourself using?
I don't know what you'd call it, but when trying to change one half of an A/B curve I lock one half down, then bend the other half. You end up with a curve that's perfectly straight until the midway point, from where it abruptly goes off at a different angle.
Of course, I say 'midway point' but I mean the point of the neutral, which may or may not be exactly midway.