Most people have had their Cover 3/Cover 2 formations beaten for a one play TD very often! Let me explain how to prevent this.
Cover 3 - A Cover 3 typically has 2 outside thirds and a middle third! The outside thirds are very vulnerable to one play TDs! To help prevent this, put both of the outside thirds in a deep half assignment! This will help them not bite down on crossers and play overtop to not let up one play TDs.
Cover 2 - A Cover 2 typically has 2 deep halves! This leaves the deep middle of the field WIDE open for one play TDs and bombs! To prevent this, put one of your LBs in a middle third assignment! This will prevent anything deep over the middle!
This will help you prevent getting bombed a lot and will help prevent one play scores!
Note:I believe the everything bomb from Bunch Te will be able to beat this.