If it were me, I wouldn't dare slow her down.. even for the sake of more consistancy in the near future. I have fast dogs... Particularly Kai, but Ember is going to be even faster (please... 3 jumps ahead of me in an instant). When you've got a fast one, it just means your handling has to be that much more on spot. A slow dog you often have time to fix mistakes. With a fast one, there is no room for error. It'll make you a better handler in the long run, as you will have to learn to be very accurate and quick thinking with your handling. You will also have to probably handle the complete opposite of Bentley. A fast dog is usually only going to get wilder if you cheerlead or do a lot of yelling. My friend with her BC who can do 6yps has had to learn to calm down and stay quiet on course, and he actually listens better as he's not getting even more keyed up off of her. As a result, her runs have improved tremendously.
Distance is also going to be your friend. You'll want to start teaching her to work independently so she doesn't have to have you right there to do her job. Being able to send a fast dog makes it easier to be where you need to be for your dog.
Just remember, consistancy will come with time and work. Speed is harder to come by. You don't want to slow her down when you may have a hard time getting it back when you're truly ready for it.
Also, after watching the video, you may want to watch how you time some of those rear crosses. The serpentine would've actually been a great place for a couple of front crosses. You had plenty of time to get there, as you're kind of waiting on her. It would tighten her up, and you wouldn't lose as many yards where you're letting her come out wide to get in behind her. It'd also probably provide more direction. Yeah, I know right now it's not such a huge deal, but if down the road you want to be competitive with her, things like that will be the difference between first place, and no placement. I'd also give her more information sooner, and like at the last tunnel on the second run, watch how far you're sending your arm out. You want a tight turn into the tunnel, but bringing your arm out so far is actually not telling her to do that. It should instead be telling your dog she's headed to the other tunnel. And, at the purple tunnel, going back to the green, I'd front cross, instead of trying to rear cross into the tunnel at such an odd angle. Sure, a more advanced dog would probably get that, but she's still a green baby dog. Even with a more advanced dog, I'd give them the easier to read option... the front cross, showing motion that they're going back to that tunnel, instead of just surprising them with it. It looks like you're worried about getting her head so she doesn't take the wrong course, but you've got to run it like you know she's going to do it. I think if you pay no attention to that wrong course, and just fc, and use forward motion to take her to the tunnel, she'd never look at it, especially since it's not really in the path.
I myself get refusals called on the way to the table a lot. It's because I haven't worked enough with the table command so that he doesn't know what to do next when my body motion stops but I give the command. I stop, he stops, period. 
Keep your chin up! You'll get there!
Someday we'll get it.