Some thoughts - Beware that the 6puck clutch disc has a certain friction coefficient. It is rated/made to be utilized with the ACT pressure plate, which in my understanding has a higher clamping force than the stock pressure plate. In addition -
You have the
1) Fidanza flywheel, which is technically designed to work with OEM clutch disc/pressure plate,
2) ACT 6puck clutch disc that was designed to mate with ACT fw/pressure plate
and
3) OEM Pressure plate that was made to work with OEM flywheel/clutch disc.
There are plenty of dimensions (mainly thickness and offsets) that could not quite be designed to work together. Worst case scenario they could be too tight or too lose and last less or have pedal issues, or if lucky, land somewhere in the middle and provide you with a working combo that lasts for the life of the disc.
However, I would not expect to get the full utility (tq rating) out of the upgraded ACT 6puck disc, without the appropriate ACT or some other increased clamping force pressure plate. Very curious how this turns out in the long term. Happy you got the sprung disc tho, an unsprung disc esp with the lighter fw, becomes a less pleasant experience to drive, without any added benefit (if its the same friction material).
As an aside, after some fiddling around - The ACT flywheel part number 600521 is the replacement for 600520 and is fully compatible with ACT 6puck clutch and ACT pressure plate. This is not so much related to the original post as it is to the updated ACT flywheel, but I figured I could throw it in here.