Not sure what stones you are using, or what condition the edge is in, but I have always found Buck knives ( older and newer )one of the easiest to get a good edge on.
This isn't meant to be rude, but have you been able to get a good edge on other knives ? The reason I ask is, it may have something to do with your technique.
Mike WTB - Benchmade Ritter S30V Mini Griptilian & Mini Griptilian scales
R.I.P Bill ( Maniacal Pete ) I only wish there was something we could have done to help...