Regarding clutch based on feedback from the caddy forums the pedal pressure should not increase significantly from stock. The caddy clutch is really really really easy so I'm actually looking forward to a little bit of pressure.
In terms of holding power, the differences between stage 4-6 is spring pressure, same flywheels, pressure plates and disc. I've asked around and there shouldn't be added noise or driveability issues between the most popular stage 3 kit and the 4 (even though one is ceramic disc and the other is stickier iron).
My main concern was abuse and how well it would withstand the many track days I have planned. 775 tq is already more than enough. Not planning to taking it to 4 figures so I see no need to move to a stage 6. I considered stage 4 as an extra bit of insurance. Stage 3 would've been just fine.
Many many more things will go boom before the clutch once we go past 700tq.
Next bit of work is to get the rear suspension more planted and more rubber on the road. So offset beefier trailing arms, beefier rear toe rods, 19" (maybe, not sure its wise for track wheels), but definitely wider 18" wheels and maybe 295 or 305s at the rear.
Of course with my track record I'll be stuffing a TVS 2300 or a procharger before any of the above happens.
Nik