Sauce will reduce during the simmer so watch how much seasoning you add as you will get some salt from the cheeses. Adding the shredded cheese more than a pinch at a time causes it to clump up in the bottom of the pan and takes longer for it to fully mix into the rest of the sauce. Also only adding a pinch at a time ensures that you get the right consistency / thickness that you are looking for. Most of the flavoring comes from the Pecorino Romano Cheese, adding more of this will strengthen the flavor (keep in mind this is a sharp cheese so a little will go a long way, always taste before adding more.) Need a thicker sauce? Add more of the shredded cheese. (Remember slowly, pinch at a time until that is melted and well mixed) This sauce does not have a strong garlic flavor so if you want a strong garlic flavor I recommend adding another teaspoon.