i think there's been a misunderstanding..
you want more realistic sounding drums..
my question is, do you want the actual snare and kick and hi hat to sound more like a REAL snare kick and hi hat,
OR
do you want the arrangement of notes .ie the 'performance' to sound more like a real person played it. (by that i mean NOT mechanical)
If it's the latter,,i've suggested altering note velocities which will not affect the speed of your session.
The velocity is how hard you hit the drum.
When you click in a midi note without actually playing a key, there's probably a preset velocity (say 100?)
If you program a whole beat by clicking in notes, every single hit is as hard as the one before it and the one after it; This is not natural.
Altering velocity would mean that some hits are softer than others, the way a real drummer would play it.
Hope that helps.