Adding too much water will make the dough sticky, it will be harder to roll out, which will cause you to overwork it and once again, it won’t be tender and flaky. When you mix the dough in the food processor, it should still look shaggy and will come come together when you pinch it between your fingers. Don’t add any more water. When you place it on the counter and bring it together with your hands, it will easily hold together. If it's falling apart and too dry, you can always add more water.