I found that the air is trapped at the master and believe this has been the issue for some of the guys in the 370Z, The HR 350'z don't seem to have much trouble bleeding the systems nor have I in those older models but the line set-ups are slightly different between the 2 cars.
I started with everything in stock position, Pedal adjustment ect.
I drained the system of fluid like you would when installing everything.
I then let it gravity bleed for about 20-25 minutes.
I tried the clutch and had some pressure at about half way point down, with quite a bit of slop at the top and a pedal that did not want to return all the way at times. Pump bled it a few times which seemed to actually make it worse.
At this point the system should have not had air but I knew it did.
I started breaking line connections loose in the left inner fender area to see if any air was present by watching the fluid come out of the nut part of the line. I did not find any here.
I then took the cover off above the master, Broke the line loose at the master cylinder about half way out until I saw fluid come out (Dropped the wrench and spent a good 20 minutes fishing it out later of the abyss down there (Hint, Do not drop wrench)
I then watched it for about 2-3 minutes as the air kept coming and spitting out of the connection. After about 2-3 minutes the air stopped coming out and turned to clear fluid, At this time I knew I had found the source of trapped air which will not bleed out easily no matter how long you spend pump bleeding it.
Tried the clutch again with much better results, Still had a bit if non return, kinda lazy coming back from about the 3/4 up position. I adjusted the master rod at the pedal until the threads are just about flush, or slightly below the back of the clevis nut (seat side) on the pedal. Pedal is now perfect with perfect return. You must retain some free play in the clevis, you cannot get the adjustment too tight.
I have now drove the car for about an hour total today and it is perfect. Perfect release, Perfect engagement, About half way in the up travel.
The TZR with the new DXD black flywheel is incredible
Going from the heavier original southbend flywheel to the new lighter "Black" flywheel with the unsprung TZR clutch changed this car 100% taking of from a stop, I can actually take off now with out the stupid jerking like the stock clutch or replacement with sprung hub does. I found it almost impossible to take off smooth with the original stock clutch and DM flywheel, It got better with the last kit and original DXD flywheel but this is just a whole new animal and I am loving it.
I have this TZR in my 90 Twin Turbo also and really like it in that car, I am blown away with it in the 370. It is perfectly smooth from the get go and shifts incredible.