I went out yesterday to test my sanded Drake 44 again on my 8.4 and iS 111 in winds of 10 - 18 knots.
Over 70 minutes of sailing, I spun out maybe 4 times, but the bad thing about the Drakes is that once the fin breaks loose, it's really hard to pull it back in. I have to drop down in speed (under 10-15 knots) to get the fin back in and to get going again. In a close slalom race, you will be in big trouble if you spinout.
This is where the magic of the Tomcat comes in. If you do push it out, it comes right back without having to pull it in.