1st to 2nd grind

Hey all, my car is a modded ZC33S with around 190bhp 330nm torque.

Has anyone experienced a 1st to 2nd grind at high revs when trying to push the car hard? I've not long had a lightened flywheel and ceramic clutch fitted. I've not fully ran the clutch in yet so this may be a factor, as with the lightened flywheel. The CSC was bled properly and the clutch is definitely disengaging fully. It only does it when I'm above say 4k revs in 1st. I'm using the correct grade Millers gearbox oil, the expensive stuff so I cant see that being a problem. I know I shouldnt have went so high up the revs with only 100 miles on the new clutch, but this level of self cobtrol is beyond me 🤣

The car goes smoothly into all gears when I'm just casual shifting around 3k, even when the car is stone cold.

Any thoughts on the subject?... does anyone say drag race their Swift?.. any experience with a lightened flywheel?

Personally I think its the lightened flywheel and I just need to shift faster when I'm above 4k revs (which wont be for another 200 miles, I promise 😅) or blip the throttle as I shift into 2nd.

Cheers