A couple things. First, the 300# split isn't really a 300# split and you are looking at linear and progressive springs. Second, the 400 split would run the front really soft and the rear really stiff. Can you saw lots of oversteer?
As far as you spring choice it should be dictated by roughly three things (obviously more than this but these are the obvious). (1) driving style; (2)current dampers; (3)tire choice (remember, tires have their own spring rate).
What dampers are you running?
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