Hi, I would try the eraser pressure mod first as this in most cases reduces the temps with no need for a de-lid. Make no mistake about it, you could damage the cell rendering your console useless.
So search for the eraser trick mod on this site. It was introduced by naked snake and is a great alternative to a de-lid.
If you don't get good results with this mod only then is it time to consider a CPU de-lid.
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