Maybe tapco1 meant three teaspoons for one cup of bread flour. I don't know how tapco1 measures out a cup of flour, that is, with a "heavy" hand or a "light" hand, or possibly something in between, but three tablespoons of Bob's Red Mill VWG weighs around 0.79 ounces. I estimate that that amount of VWG will increase the protein content of one cup of bread flour (I use the King Arthur bread flour for the calculation) to around 21.4%.
Peter