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not really sure why you are worried about rake from a setup point of view... that is more asthetic than anything. The correct way to set the car is to scale it, then setup the corner heights for the best f/r distribution and even out the cross weights. So, for a simple case, say you want to shift more % of weight forward, you jack the car up (increase the rake), but setting the car up based on rake is a bit cart before the horse.
Set the weights and the rake will be what it is going to be. Most of us don't have scales, so ask around some of your local performance alignment shops and see if they do this. Here in SoCal, I just took my car to Johnson Alignment in Torrance last Thursday and had the car scaled (I have coil-overs at all corners, so more adjustable than stock) and aligned. All said and done, the cross weights were within 6 lbs and I don't have much rake at all (though I wish I did for looks...)
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