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I've never heard, of the B&G rs2 coilovers. If they are adjustable, find out what rates they adjust too, and then you can swap to any rates you want within that range.
About the tokico HTS shocks, you are correct, but Ground control has sleeve "coilovers" out for our app, which should fit allowing you to use all of the super popular eibach straight springs of any rate.
The mugen shocks are untouched, but the rates im using are in the useable range so they are fine. im running 180 fronts and 350 rears. (they are progressive, so thats the max rate of each spring) This is a pretty comfy setup, slightly stiffer then stock, yet with good weight transfer stiffen up and really grip well and rolls much less then the stock setup.
The Front or Rear biased setup has always been up for debate. By biased i mean which end is stiffer. Japan generally runs a front biased setup, and in the US people generally run Rear biased. They difference being the use of anti-roll bars. Japanese tuners use huge rear bars. Its all more or less a means to the same end. It also has a lot to do with the particular track your at.
In VERY simplified terms understeer vs oversteer is determined by which end F/R has more or less roll resistance. The end that has the more roll resistance (IN GENERAL) will break free first. But on a bumpy track running stiff springs will make the car hop and skip over bumps and cracks, which is not good for handling. So to keep the roll resistance but be able to absorb the bumps they will run less spring, but stiffer roll bars.
Its all a very complex balance of forces and a lot has to do with the drivers preference.
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