I've been working @ this. I have my CPU cycles way down.
When I get some time, (got a new [24/7] job), I have a couple of tests to nail what I did wrong, or what others might do wrong.
[Core/MD/kernel version/nvidia version drivers (Core/MD's), nouveau drivers, ubuntu-restricted-extras, dist-upgrade, blah, blah, blah.
My ION has good % now without disabling stuff.