Time to Replace the clutch?

kevin.z

Hello, everyone
I have had my z for 14000 km's now and i am thinking of replacing my clutch. The reason for that is because the clutch is going softer and softer everyday. I am beginning to worry about the clutch and so i drive slowly and clutching less. If i drive like a nanny, the clutch is fine.
However, if i drive spiritly and shifting really fast at high rpms, the clutch goes really soft to point that the point that u cant feel the engagement point. The clutch feels like the arcade game battle gear 4, if u have played that game before. However, there is no clutch smell nor slipping at all even when the clutch is really soft. So i am assuming it is not signs of wear-out clutch?
It seems when the car is running hot, the clutch goes soft?
The dealership quoted me $3k to replace the clutch, which is ridiculous. If I am replacing my clutch, i am definitely going aftermarket.

Will upgrading my clutch void my powertrain warranty? I mite have transmission problems as well as i occasionaly grind 5th gear.

Should I upgrade my clutch? Or is my clutch fine?

Also, if i am upgrading my clutch, should i go JWT or OS Giken triple plate? OR any other suggestions?

Thanks
I greatly apprecaite you guys help
Kevin