I actually have somewhat of a bad habit of holding my hands too low, so I'm always thinking of lifting my hands up and more forward, simply to correct my own position, so I have yet to start focusing on any more elevation, slight or otherwise.
As for the twisting the poll question, one of the horses I ride does that, and it's the result of him not properly stretching into both reins because of a lack of suppleness (granted, he's almost 25 years old, but he doesn't get cut any slack). To help him loosen up a little more through his back I like to have him canter with a little bit of counter flexion, especially during warm up, then I allow him to return to true flexion and I find he's much more relaxed, supple, and stretching through his back into both reins.
"Always be yourself. Unless you can be a unicorn. Then, always be a unicorn."