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@renaultpartsdirect on here might be able to help.
What have you done with that tensioner spring? You say you've reconned those parts. It's not ideal to re-use the tensioner either, if it fails the aux belt will likely take out your cambelt when it goes and destroy the engine.
I would advise against a lightened crank pulley tbh.
They are haramonically balanced/dampened with the rubber damper, removing this you are then opening it up to vibrations from the crank possibly destroying the engine.
Bit of hard cornering on the road and also do a steady session on track and come in and let them cool. They should get better and better as long as you let them cool down.