Wow, I must have tiny little cojones... I can beat the 9 ball ghost more than 50% of the time, and I wouldn't even think about going on the road. I get that it's about matching up more than raw skill, and I haven't gambled enough in different situations to where I have needed to hone that skill, but it's still nice to have the raw talent there to back it up. I can't see anyone at Rhea's level ever beating someone at my level (or above) consistently, the spot just wouldn't be enough unless I (or someone like me) was just being stupid or over confident with the spot, and even then you would think the adjustment would happen quickly. But maybe I'm naive and there are a bunch of B/C players out there willing to lose a bunch of money or A players willing to make a bad game and do the same...
That being said, I will offer some practice advice. There are tons of drills out there that focus on key areas of the game - back and forth 1/2 rail position, up and down position, rail and near-rail shots, and getting back to the center of the table. They are easy to find, I would suggest finding some that challenge you and working on them to really isolate and perfect those repetitive patterns that are needed in almost every game. As you work on those standard patterns then you can throw in the recovery shots (2/3 rails), working on thinner cuts, banks, etc. to extend your offense. And of course working on safeties, even pros run out less then they end up playing safe so you need to work on safes and kicking.
One more thing. I like a drill Jerry Briesath showed me a long time ago, similar to ghost but with a twist. Throw out 4 balls, make sure nothing is tied up, take ball in hand, and try to run the balls out. The catch - you have to do it "perfectly" - no tough or low percentage shots, no banks, try not to run into other balls unless intentional, etc. You know what you are trying to do, if you don't do it within reason, set the shot up again and try it again, maybe even multiple times and multiple ways. If you get out without an error, score a point, otherwise nothing. When you can succeed 16 out of 20, then add a ball. At my level with 6 balls I typically score 13 - 15 out of 20, so easy to lose focus and miss a ball, overrun position and end up with a tough shot or bank, etc. This will show you where you really stand along with the ghost and gives you good practice on getting out in end game situations and also lets you score your progress over time.
Good luck!
Scott