Yeah, Mrs. Chipotle, I don't think Alfredo sauce is something to make light. Instead of trying that, just don't mix as much in the pasta.
It's really about the samething ... either less of the good stuff in the sauce or less of the good stuff on the food. Either way is about the same in my view. And if you make the Alfredo sauce normally, it will stick to the noodles and not be runny.