I’m 6’ 4” and like to use a butt seat on an adjustable, 30 inch, seat pedestal. At its tallest, it’s still is about 6 inches too short. I tried adding an 11” pedastle and it makes it too tall and unsteady. Any suggestions as to how to make it taller? Maybe add a 6 inch block of wood to the bottom of the seat? Can I cut an 11 inch pedastle down? Thanks for your suggestions.