The kind of attack you use always depends on the character. I feel this is a monumental, tragic (not in the pathos sense) music, and sharp attacks will detract from the character and be vulgar. It has to have a dignified quality, dignified in its tragedy, and not an angry bitterness, which would be conveyed by strong attacks.More importantly though is voicing the chord. Do not make the common mistake of playing all the notes equally. Rather you should practice like this: play all the Cs in the chord at a certain volume. Then, play all of the Gs and fit them "inside" the Cs. in other words they should be a little bit less. The least of all should be on the E-flats. The third of a chord in a voicing like this should serve as the tint of it, and should not be too prominent.Voicing is everything; it conveys the world of sound directly to the audience. The Cs should sound like a column; the Gs like the tablet on top; and the E-flats like the ornaments carved into the tablet. Something that your peripheral vision perceives, but still attached to the whole structure.Walter Ramsey