In most GM drum maps you'll have 3 different hat sounds (open, closed and pedal) but in EZD and SD you'll have several and you must mix them up accoringly to get it right. I believe that is where you are going wrong. In EZD there are several hat hits that are the same yet different. You cannot use one key in the Piano Roll. In SD and EZD when you do the hat you must make use of all the hat samples. It takes some practice to get them not too far apart because then they again sound fake. I use Sonar and use the CAL script for random velocities. Hats I work the velocities on in the DAW's piano roll. Kick and Snare I generall leave all the hits at the same velocity in the DAW because in the studio you're gonna comp em or whatever. Id worry about my velocities in the DAW and then send em out to SD.

I wouldnt worry much about the velocity in SD Id set it and forget it if its like that of EZD.

Not sure how they can sound fake because the EZD stuff I do sounds very real to me.

Isnt SD from Toontrack? I use EZD and I almost never use the room mics.

Superior drummer 3 mixing