Almost defintely your clutch, dragging most likely.
It could be the cable has done the melting trick, near the turbo and is losing motion here, I had this problem too.
I know on mine I need to fully depress to the very last mm to get a nice change, this was confusing me at first on mine as you can't do the usual lazy change on these cars.
I suspect mine has uprated clutch but don't know for sure as did not put it in, but these are even worse for needing ALL the whole travel.
tabetha