You might try Kirk at Bigfoot, I bought a set off him. That said, I use bamboo all the time. I like em about 1/4" thick so the pressure roller can push em against the conveyor easily.
One other thing, I sold a sander and bought another bigger one because I was getting .004 to .005 difference in random places on lams. Same results !
Finally figured out it was the splice in the conveyor belt. So I ran the conveyor and very carefully let the sander head down til it started brushing the belt all the way around. Fixed....
The first sander was prob good, just needed the belt dressed! LOL