i'm sooo not trying to be the difficult one here, but fwiw, our OT said she heard a talk by the wilberger daughter some years back, and she (wilberger) doesn't even recommend it anymore. not that it's harmful in *any* way, and if it works even a smidge for your kid, i say DO IT. her point (OT), i think, was that it's not really a reliable go-to for most kids. the fact that it's so clinical, she says, just doesn't make sense. it doesn't matter if you do it x number of strokes, in x kind of a way. she said it's really more about the right kind of input for each kid. for some, that means scratching the skin with light pressure (with brush or your own fingernails). for others, that means deep pressure on certain parts. our best success has been trying to get my daughter to touch her in all different ways, then really watching to see what seems to help. also, asking her what feels good has been successful lately. for her, she will ask for "strokes" - me starting at the top of her head with both hands, then pushing down her head/face/neck/chest/belly/legs with pressure. also, taking each finger and toe individually, kind of pulling and shaking it, then strokes down the hand or foot. she also really likes "chops"- i put my hands vertical, and let them kind of fall down on her body in a symmetrical chopping motion. i do it on her back, legs, arms, etc.
good luck finding what works best!! for us, it certainly changes, so try to be flexible, too

.