What type of angoras do you have? They look like English in your profile picture.
It really depends on each bun, because they will all very slightly one the amount of fiber they produce ect. And if you have English they don’t have the gaurd hairs like French’s do to prevent matting, so one might just be “rougher” with his coat and not groom as much so he mats more.
If Cashew’s fiber is a poorer quality, he might have just inherited a bad gene for fiber, it really is hard to say and I don’t think anybody could tell you for sure. My rabbit (Moxie, who is also an angora) tends to have hay stick to her bum and behind her back legs. That is because she normally has loose fur there and loose wool attracts more hay than regular fur that is intact.
Shaving your angora can be difficult, and if it isn’t long enough you probably won’t be able to use it for knitting. (but maybe crafting things like felted animals would work) I cut off Moxie’s wool last year because I didn’t have an AC and she was very hot. I just used scissors.
Don’t know if this helped, but if you have any other questions I would be happy to do my best to answer them! 