Gary, you certainly made the best achievable out of that piano sample, but it is impossible to "edit" a piano with a limited sample into a totally realistic piano. The sample is the raw material of the tone, and the editing functions of keyboards, even synthesizers cannot change anything about the sample itself. Again, as DNJ has said several times, this is about nuances of the piano sound that are probably pointless if the piano is used in a mix with styles, it becomes important for solo piano if you listen closely. If the original sample sounds like a bright Steinway and instead you want to hear a Boesendorfer, you need a different sample and can't just edit it.