Yeah they're tough to get right. But it's honestly just trial and error until you get it right.
Just treat those hits as you would to ghost notes for the snare, very low velocity.
Remember that one hand is stronger than the other.
Which beats would a drummer accentuate? Every bar? every second beat? every third?
Something that might sound cool would be: 127, 40, 50, 37, 70, 35, 49, 40. and so on.
That might work, or not. It depends on the samples and what you want to achieve.
Loop that section and go through each hit until it sounds just like you want it to.