Not trying to be critical, but do you drive the Z like you do the Forrester? I noticed from your Forrester video that you turn the wheel into the corner and hold it for a long time. To be fast in a Z you need to get used to the rear of the car moving around a lot, especially when stock. The trick is to learn what's too much and what's just right. To someone that's never lapped a Z hard before this can feel like the car is going to kill you. You will be unwinding the wheel after turn in much faster in the Z. If you're not then it's like driving around with your foot on the brakes. It also helps to get the entry speed up, which looks lower across most of your data.
Cary