If you want a thicker batter, try this beer batter recipe-
12oz beer
12oz flour (1:1 ratio with beer if you decide to increase the recipe)
1 egg
2 tbsp paprika
1 tbsp garlic powder
1 tbsp lemon pepper

Mix it all up and let it sit covered for 1-2 hrs, and be sure your filets are dry when you dip them. This stuff goes on thick and sticks well. It is fantastic, i'm telling you. Give it a try if you want some restaurant-thick breading. Great for fish sandwiches too.