The aluminum flywheel uses a steel ring for the fiction area of the clutch disk. What I have read. It's not a good DD flywheel. The steel ring doesn't transfer the heat too good to the aluminum. For track, it good.
Most people seem to have to adjust the Z1 CMAK set up more often. The ZSpeed is set it and forget it. There have been some teething problems with both. But the ZSpeed is the one I would get.
That Z1 14lbs flywheel is nice. But remember. The lighter the wheel, the less rotating mass you have. Hole shots will take more rpms so that you don't bog off the line. Down shifts with out rev match or heal and toe will lock the rear tires for a moment. Used to call this compression patches.
Your upshifts will take some getting use to. As the engine will now spin faster and lose rpms faster between shifts. And with a lighter flywheel. It may set off the knock sensors.
My set-up would be the Z1 14 lbs flywheel. The OS Giken TR series dual disk clutch, ZSpeed CMAK, RJM clutch pedal, Tilton master cylinder Coolworxs shifter, and a Z1 poly tranny mount. And pray that it doesn't set off the knock sensors.