Sandpaper, start with 6 and work my way to 12000 MM.
I've used the HSS gouges and they work fine if sharp . I bought all the Ewt tools except the diamond and they are good, but recently I bought the Rockler roughing carbide kit that comes without a handle and made a handle for it and now that's my new favorite!
I noticed that on sale. Does it cut flat like EWT or on a bevel?