The main and clutch arm springs serve different purposes and operate pretty much independent of one another.
I'm not sure if the 13g will give you everything you're looking for, but I'd be interested in the results. Really good low end is often found in the lighter (9-11g) weights, but as BuggyMaster pointed out - you may lose some top end.
Most people gain back the top end through ditching the stock airbox in favor of a UNI filter (like in the level 1 air performance package we have) and/or upgrading the exhaust. When changing the air/fuel system like this, you'll have to rejet the carburetor, but there are videos here and tutorials on my site, as well.
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- Mike
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