David,
Cain at Wolf Performance has a rev hang solution by changing the flywheel. The factory had an ECU fix that I have but they stopped selling it.
As Jan says take the changes slowly. You can see how bad it is by taking your foot off the throttle with the clutch depressed and watch the rev meter.
John


JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"