I'd also look into the Alloy Art TXR stabilizer. I just installed it on to my 06 EG and really like the design. I ordered it thru M&M cycles and saved 20% off the MSRP price.
True Track....it'll solve the design flaw....you already said it aint the steer'n head, or the tires...mine did it new...installed the TT and never again...money well spent IMO
try letting go of the bars...... ok not in a corner. i had the same prob after i added wild1 518's to my rkc. i finally realized that i was causing the front end to wobble by resting too much of my weight on the bars. it was creating a wobble that would get really bad at about 70mph. i have had to re-learn how to control my bike. may or may not be your prob.