Thanks Quanah,
Looks like I do NOT have any alias's defined - which is a good thing considering that would be bad DIT design as you mentioned.
That being said, this means I still do not have an explanation for why my MDB consumers are using up to 4x the CPU compared to my HDB consumers. As I mentioned before, we are processing equivalent numbers of requests on both HDB and MDB. Any further suggestions you have on where to inspect next would be appreciated. Planning to sift through debug logs again and compare the two. Regards, Paul