Error Handling With Execute Package Task

I have a main package that calls several other packages using Execute Package Tasks. I also have OnPreExecute, OnPostExecute, and OnError event handlers at the package level to audit the beginning and completion of each package. I want to prevent each task from bubbling up to the package event handlers as well as prevent each task from bubbling up to the main package event handlers. I've tried setting the Propagate variable for each of the event handlers to False and setting the DisableEventHandlers property of each task to True but neither solution seems to work. Is there a way to do this that I'm missing?