Well, in my case I've switched to true-type rears, so I can't directly compare the ratios from the stock spring setup anyways. The rule of thumb for avoiding near-1.0 (I assume for harmonic reasons between front/rear bounce) makes sense, but I'll have to figure out how to do the freq calculations for my setup first.
My current setup is definitely oriented in the oversteer direction (not that I know the math, I just know that every single time I get close to being in trouble, it's from oversteer not understeer, even in a faster sweeping corner
), and I'm pretty comfy with that.