It all comes down to this... don't use IKS 88500's for the rear bearings in a DeWalt Frame 196 motor.
On a whim I decided to try a "Wide Cup" version of the 88500 that Accurate Bearing carries. It's a JAF bearing.
Night and day! My frame 196 is now quiet and powerful with no extra heat. The IKS design is the basis of about a year and a half of frustration with this project saw on my part.
Now I need to make a proper table for my GWI, align everything, and start making sawdust!