If its always turning out well charred, I think the key is lower heat or don't leave it on the grill for so long. You'll have to experiment a little to get used to how fast your grill cooks. Luckily, you know how long it takes to cook it too much, so if you remove the food a couple of minutes earlier, you should be in decent shape.
And Maddy is right, only flip it once.

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