I don't know what kit is being used but I find most individual instruments in a drum synth are always recorded pretty hot. There is an upper limit to how loud a track will go, it may be something needs to be turned down. Can't make each track louder than the next.

Figured out the snare issue. I had a high pass filter on it. Duh lol dozy twonk. Did that ages ago when playing around and completely forgot. Another question. What should I be doing with the tracks mains L and mains R, in terms of busing etc? AD created these tracks for me and I've never been sure about them. According to a cakewalk blog they're a submix and output for the drums and can be used for parallel comp and adding effects. I've routed them to my drums bus for now...

I usually do put a compressor on the drum bus. It's usually an LA-2A model and I use very little compression. -.5bdb of gain reduction. For the snare and overheads, maybe -2 or 3 db of gain reduction and -1db on the room.
 
I did not mention though. for the individual kit pieces, I mix them with Sonar's mixer and not AD's interface.
 
For the cymbals, I usually like to control them differently volume wise. I mix them in while mixing the overheads and room mics but they may need boost or cut in the overall mix. That's one reason I separate all my midi kit pieces. I can adjust their volume with their midi channels input gain. The volume sliders don't work in AD, which I never understood, but it's not a big deal since the input gain can be controlled.