I just figured this one out with the cymbals when doing my Lord's Prayer arrangement. If a single hit just won't do it, you can combine cymbals. In the Lord's Prayer I had three crashed in a row, each getting louder. The last one I couldn't quite get powerful enough, so I used both D and C#. It produced a very nice sound!
I've used that same trick before, too, cp. It works great!
Something that also works well is to use the C# as a grace note to the D. It makes the crash sound extra dramatic, as well as vary the sound of the technique.
Yeah, that would work, too!
The D crash is perfect--just a kschhhhh. Not like some others I've heard that go pa-kschhhhh. I tried simulating a pa-kschhhh by putting a ping (below the gongs, I think) and then the D crash.