CPU overload on a brand new 12 Core Mac Pro

Having invested serious money in a new 12 Core Mac Pro, it pains me to say I'm having CPU performance issues Running Pro Tools 11.3.1



I mainly do music and sound design to picture, I use a lot of VI's and plug-ins and I output my video with a Blackmagic Intensity Thunderbolt.



Today I have been working on a 40second trailer with no VI's and minimal plug-ins. I have the System Usage window up and I'm barely hitting 8% of CPU power yet I'm getting overload messages whilst simply editing audio.



I'm working from an AAF with MXF HD video (633MB) which looks like its chewing up quite a lot of RAM but I'm still only at 33% (of 32Gig). The Disk meter isn't registering at all so I don't think the HD is the problem. Baring in mind AAF with MXF is an Avid format, surly this should run without problems?.



I'm loathe to keep bumping up the H/W buffer as I spent a lot of money to have a low latency workstation.



I'm also getting serious problems when doing realtime bounces (offline works fine).



Does anyone out there have any advice?



My system:



Late 2014 2.7GHz 12 Core Mac Pro

32Gig OWC DDR3 1866MHz RAM

G-Raid 8TB Thunderbolt Drive

Avid 003 Factory

Pro Tools 11.3.1

Blackmagic Intensity Pro Thunderbolt