Seconded advice on focusing on velocities. Gotta be realistic with them: strong on 1 and 3 (5, 7) , a bit weaker on 2 and 4 (6, 8), and progressively weaker on off beats. Do it by hand for some natural variation. You can copy the beat and modify the velocities slightly, even just by grabbing and dragging around a bit in the same general area of velocity. You can also turn off the grid and slightly move hits around to humanise the timing a little.