Found the pics about the mod to the flasher module. Basically, the ribbon inside is a comparator resistor. It uses this compare the resistance of the bulbs to this resistor. When the resistance is lower in the light circuit (when a bulb burns out), the resistance no longer matches and hyper flashes. By grinding down this resistor, you decrease the resistance. Eventually, you will match the resistance of the LEDs and will stop hyper flashing.
I had to use a Dremel to grind it down and in doing so, I broke it off from the board so I had to re-solder it. I think an easier way would be to remove it and solder in a strand of small wire. Tried without a resistor at all and the flasher wouldn't work, but it didn't damage it neither. Since I have load resistors with my rear lights, I still needed a fairly high resistance.