The rear is to low. Look at the tunnel on the inside of the car where the storage bins used to be. You will probably see the floor pushed up slightly. This is where the long locating links are making contact under compression. As soon as they hit, you play pitch and catch.
I had this exact condition about 12 years ago at Sebring and two very smart young men showed me the errors of my ways. The same two (now older) men that just helped Mazda win the Grand Am GT Manufactures Championship yesterday!
As a data point, may I suggest using a slight rake front to rear. I generally use about 3/4 inch. Another data point...I use 500/250 spring rate, no rear bar, a string width toe in in the rear and about 2 deg negative camber. On the front, I use a big Speedway bar with a secret (right Steve?) bend in the arms, and set to ultra stiff, slightly less than 3/8 toe out with about 2.5-3 deg negative camber.
Don't forget to reset all your toe numbers after you jack the car around.
And oh yeah, Steve learned everything he knows about Mazdas from those two guys from Sunrise, Fl.
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