OK, PE, this is a pretty basic problem. I'm not sure what the problem is, but here are a few possibilities that come to mind:
Is your wick heavy enough? I find it is harder to control very light wicks. I like to have at least 4 oz (100 g) at the end of each chain.
How long are your chains? Are they too long? You should be able to hold your hand so that your noggin is out of bashing-range.
Let's break down the reverse crossover motion, which seems to be giving you trouble.
1. Do a plain reverse side-circle, with you palm up.
2. Extend your arm forward, so that it is roughly in line with the middle of your body. Keep doing the circles.
3. When the wick is at about 3:00 o'clock--at its farthest point from you--smoothly rotate your hand as if you suddenly forgot what the back of your hand looks like and you need to remind yourself.
4. Hopefully this is bringing the wick past your noggin and into a good crossover. When the wick comes around to 3:00 o'clock again, flip your hand palm-up again, having had an adequate opportunity to examine the back of your hand.
This move is all in the wrist--you don't need to move your arm, gyrate your body, anything. Try to do this with as much economy of motion as possible (I'd actually recommend that for all moves, in fact).
Start doing this with just your dominant hand. Keep at it. Do it a lot. Get the motion well and truly embedded in your muscle-memory. Then do it with your other hand, a lot.
Hope this helps.