We've also, in the past, put 'better' sailors on other boats to speed them up and get them a taste of being in the thick of it.
This is an excellent idea that works wonders. When we started racing again after a 25 yr break, we loaded Victoria with a bunch of stud and stud-ette racers. These are people who race 2-3 days /week on their own (mostly <30') boats. They descended on our boat and promptly deconstructed it (remove cowls, pull dodger & bimini, etc), making it more or less race ready. I was a little put off, but went with it. We came in near the back of the pack after 21 hours racing.
Five years later, the crew has rotated a bit but we still do one (very competitive) race and have managed to move into the top 50% (barely) of our class. Having them aboard has taught me a lot. And that's on top of 40 years experience. Truly... you don't know how to sail until you've raced.