Why is it so impossible?

Why is it so literally impossible to knit with bamboo needles? The tension is hard as hell, even when I casted on over both needles and pulled the second out to have a loose cast on. The cable is thicker than what I'm used to by 2x or more. I tried every way I can think of to get them to work and they just won't. If I was doing something that needed all 29" they might work. But doing magic loop on these needles is impossible. And they're the only circulars I don't have with something except my two US size 6 16"s.And I was hoping to use magic loop instead of having to use 2 circulars.

Oh how I need to get a bigger needle supply...