Did you try my mix of galfer one side of the disk and Honda on the other, it worked for me!
So far I have tried
Beveling the leading edges of the pads
Cleaning disks, pads, and rotors
Completely disassembling and cleaning the calipers
That stupid orange brake pad goo
Sanding pads and rotors
Swapping sides on pads
Removing and re-installing various parts of the front end to check for sympathetic vibrations
Linking the front rotors with zip ties across the wheel in the hope that one rotor might dampen the vibrations of the other (this actually did help some but I was paranoid about a zip tie coming loose and doing damage so I took them out)
Bled the entire system two or three times
Today I may check the fork oil, just because.
I've also made sure to properly align the forks and follow all proper procedures when performing the above listed lunacy. The longest I've been without the squeal is one day. It has always come back.
Galfer rotors are out of the question for this bike. Before I spend $500 on rotors I'll set it and buy something that doesn't squeal and has adjustable suspension.