I’m using the Porsche trans fluid and I have no 2nd gear shift problems in mid 40-80F weather.
Just for info, here’s my thread on the 2nd gear detent replacement:
https://986forum.com/forums/performance-technical-chat/70667-gbox-2nd-gear-detent-install-question.html
I don’t think the detent will help the hard shift issue. I did it as PM.
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Rgds, Fred
#317 550 Spyder Anniversary Edition 2004 Boxster S, 3.8L Flat Six Innovations engine, PSS9s, etc, etc . . .
The contents of my posts are for entertainment only. As confirmed by my many motor sports fails, I am not qualified to give product endorsements or mechanical advice 
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