How to make stylized trees a solid color?

I’m trying to make a stylized tree which has leaves that are a solid color (solid green). The problem is that there are random spots of darkness (especially where multiple leaves meet), how do I prevent that? I’ve tried increasing the brightness of the leaves and have disabled cast shadow, and putting the decal in all Maps instead of just ColorMap. None of these solutions have worked.

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You cannot. It is a flaw of ROBLOX that annoys me alot.