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Personally i think it's "stage 2" cars with 630cc injectors that are the problem too. The pump is struggling i think.
Not seen a stage 1 or standard Megane do it yet tbh.
@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.