MA128, based on your posts I think you are on the right track by replacing your rear springs with 2011+ M Sport springs which are linear vs. the 2008-2010 progressive springs. I suspect changing just the rear springs will significantly improve the way your car feels and drives with the other mods you already have.
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2009 BMW LeMans Blue 135i/Dinan Stage 2 tune/Alufelgen SF-71s/M3 suspension components/Koni Sport adjustable dampers/ETS FMIC/M3 paddle shifters/Alpina B3 TCU flash/VRSF charge pipe
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