We used to have this problem with Super Blue Sludge also. We eventually learned that it is all in the consistency of the bead release. The problem was we weren't making it thin enough and when put on too thick, it can make it very difficult to get the bead off of the mandrel.
What has worked for us is slightly thinning the bead release from what it originally comes. After dipping your mandrel, you should be able to hold it upright and tap the end on your work bench twice, which should smooth out the build up at the end. If it doesn't smooth out after two taps, then it is too thick.
We can't tell you how much easier it is to get the beads off after soaking them in water to help soften the release. I you find this helpful.