Baer 14" bbk help

[bpmack16]

So I installed the pro-performance 14" bbk on my 1972 c10 around the beginning of the summer. Let me start by saying all the guys at pro-performance have been great and very helpful. But none of us can figure out the problem I am having.
So here we go.
After installing the kit front and rear it became clear there was a problem. Once the brakes heat up the truck starts to make a notable grinding/ humming noise from the front end. This happens both left turning and right turning. The noise go's away when I pres on the brakes. We have replaced the steering box, controls arms, shocks, springs, ex... The noise is still there. We removed the kit several times to check if there was any uneven ware, no such issue was discovered. We changed brake pads , nope that didn't do it. We removed the inner wheel wels just to confirm, nope. So what could this noise be. As you can see this has been burning a hole in my pocket, pro-performance's pocket and my mechanic's pocket we have way over 3 weeks in trying to figure this out. A call was also made to Baer but no suggestions helped. Let me allso add, we checked drive shaft play and rear end as well all is good. HELP please.