I've experienced this same feeling with a couple of other cars. The clutch gets heated up for the first time and then it feels softer thereafter. I believe it is normal. The contact point sometimes feels like it changes a little bit as well.
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2010 370Z Nismo, Silver / GTM Stage-1 SC / Custom Tune / GTM Oil Cooler / FI Resonated Test Pipes / FI CBE / Alpine HU / Focal's / JL AMP & Sub / AP Racing BBK / TTA TE-37's / RE-11's / KW V3's / SPC Camber Arms / Whiteline Sways
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