You got it!I'm no baking expert, that would be my boyfriend. But from what I've gathered watching him in the kitchen, and from my own late night cookie-baking endeavors, you may have used more cornstarch than usual, which is always a good thing IMO. Makes them a bit thicker, more substantial, chewy, all around better! But it's baking, and I'm a noob...it could be so many things. That being said, I second your original plan or ruthless trial and error. Please reach out if you need a taste-tester!