The first problem is definitely the proportions! Baking, the most important thing is the portion of wet ingredients inside the recipe. This is not the same as we and noodles, more noodles add water, more water add noodles, not. According to what you said, you are not using a laminating nozzle to make cookies, it's like making them into flaky cookies, right? Generally that kind of cookies have to be made into a dough, and then refrigerated for a while, and then cut, but you are very likely to be butter or other oils, milk or something, more, and then the temperature, the general temperature of the oven is lower than the labeled temperature, you preheat the oven? Finally, do pastry, no one time success, slowly, a little less do, more test a few times, you will have skills. I wish you success.