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The grapes look awesome!! Again, I wish I could help you out, but I struggle with the same thing!!
I have painted tons of grapes. I use ultra marine and burnt umber about half and half to make a black. Then I mix a dark green with cad yellow light. You will need to grey that with red. You then vary your greens either with touches of the black or yellow light adding small amounts of white as needed. I create a glow in the grape by using yellow and red light but mostly yellow and put that on the side of the grape away from the light source. You will need to add some white to it. Only a small amount so that it appears that the light is passing through the grape. I will also mix a soft pinky color and put some blush on some of the grapes to give them some color. This is what I do and it may not suit you at all. Whatever you do, please have fun.