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With stock gearing, I don’t think you want to take a lot more weight off the rotating engine assembly than the Aluminum pressure plate. The “sport” one still has a steel friction surface, the RSR one is a plasma sprayed aluminum friction surface. The “RSR” light flywheel I think really needs close ratio gears before the rev drop doesn’t exceed shift speed making up shifts jerky unless you really punish the syncros. 3rd gear Syncro was the one I seemed to kill first.
Pulling weight off the disk however reduces inertia that the syncros have to overcome to match input and output speeds. I’ve see some drill the gears themselves to reduce some weight but I don’t think the risk/reward is worth it for a street car.
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