which suby forums have you gone to. i used to be part of i-club.com and rs25.com and they are all pretty cool.
if you have 100k on the original clutch bro switch it out. i had like 41k on the original clutch before i sold it and it felt like it was getting weaker and weaker as i drove it. but i drive pretty hard, no hard launches, just a lot of downshifting, rev matching, and occasional power shifting. i just think you should change it out. get an act street clutch or whatever. try rs25.com they can help you or i-club.com. hope everything works out for you.