You can the following. Change the pour temp, change the cooling procedure, modify the wax.
Most likely the 4630 is hardening the wax enough when the wax cools, it pulls away in jar.
Better adhesion comes with softer wax. Instead of 4630, you could try 4627 or another soft parrafin.
if you are having trouble with CD wick. Test with jar a little more than half full to determine happy place for wick.
You should try 4-6 CD wicks.