Nice.
I actually forgot we support this. :-)
As I was just about to suggest you to use a custom deployer.
But afair, you need to exclude all possible packages;
e.g. org.sl4fj.acme needs to be excluded as well, if you want org.sl4j.acme.Acme to be loaded from parent
--> it means that excluded doesn't take wildcard, but an exact name