The regular Drum Kit From Hell sound is rather flat in my opinion and I tend to work in Adobe Soundbooth with them, to make them sound fatter and heavier. How do you guys go about it? I'm sure mine can be improved greatly.

i dont use the kicks.uke: I blend the snare with something else (like the sneap snare). Compress and gate the toms. parallel comp everything.
how did you add another snare? i was trying to look and see if i can use different wavs in ez, but didnt s any import buttons
I know this isn't the answer you want to hear, but get yourself Addictive Drums. It's a far better sounding program.
I struggled with EZdrummer for years because of how thin it sounds, but after I got AD things improved dramatically.