calm the hell down.

Look at this as a good thing. Making ap scale from vit was an experiment. A failed one because people still chose str accessories based on what had parry to avoid.
Step 1. Force the vit accessories.
Step 2. revert to str only scaling
Step 3. replace parry and accuracy with tenacity increasing damage there
Step 4. balance it.

You do not have all the info yet. You have no idea how the end product will turn out. So chill the hell out. Stop comparing your tank dps to damage dealers. Compare to other tanks. Instead of hoping for big numbers, hope for balance while maintaining the ability to stance dance at higher skill levels.