Pasta and cheese

We did not have any of the pasta shells the dish called for but we used some pasta called radiatore. We also felt it was a little dry maybe less bread crumbs or because we used the wrong pasta?
1 lb small or med pasta shells
5 Tablespoons unsalted butter divided
1 cup heavy cream
8 oz. fontina cheese shredded
salt
pinch of nutmeg
1/3 cup panko bread crumbs
1/4 fresh grated parmesan cheese
Preheat oven to 400
cook pasta according to directions just till 1 2 minutes shy of al dente
dice 4 tablespoons of butter in a large mixing bowl. Warm cream in a small sauce pan or microwave. Cover and keep warm
When pasta is cooked add to bowl and toss to coat well, next stir in warm cream and cheese till it starts to melt.
Salt to taste and nutmeg
Pour into a butter 2 quart casserole dish. Melt remaining butter and mix in panco breadcrumbs and parmesan cheese, toss with a fork and sprinkle evenly over pasta.
Bake until sauce is bubbling and top turns golden brown about 20 minutes.