Sometimes it takes going through all the different available samples to find what you want. When doing drums, I often go to the "studio tool kit".
Also there are a couple cymbal swells in Orchestra-Percussion around the Bflat3 area.
Another tip is to play every note in on your midi controller. You can fix timing, but the varying velocity gives the sound a much more "human" feel.
hope it helps.
It might also be worth checking into third-party produced instrument plugins. I recently got ToonTracks' EZ Drummer, and it's fantastic. Really incredible sounds, lots of options, etc. Cymbal swells are definitely harder to do, though. It might be worth looking into purchasing an actual cymbal and some sticks and just recording those cymbal swells & flourishes the old fashioned way.
Or you could peruse the internet for free loop libraries. Do a Google search for something like "loop cymbal swell free" and see what you come up with!