Stop listening to people that know NOTHING about hair.
Single donor hair isn't higher quality nor is it truly single donor.
It also makes THIN bundles.
You cannot get THICK, single donor bundles.
All the hair on your head isn't one length, the same goes for donors.
After hackling you have maybe 2 ounces of same length hair, if that.
You have to source from multiple heads of hair to get double drawn thick bundles.
There is no way around this.