So the key is warming up the handles first? I didn't do that when I tried the cornstarch first....hmmmmmmmmm! It's worth another try!
So can you give us a step by step?
Warm the handles, then pack on the cornstarch? Did you rub a lot? Do you keep warming the handles after the cornstarch is on?
This is ok but never rub the handles hardly, use a clean towel, keep warming and rubbing till the cornstartch absorve the oil...warming and rubbing...warming and rubbing...that is what I did...

Psd: THIS DOESN´T WORK ON VERY DARKENED HANDLES.