Don't forget to hit a friendly reforger close to you before you venture out in the world. Make sure to ditch any agility gear where you already have access to better strength based gear first.
Getting the 200 more dodge rating than parry rating will be rather hard, but make sure you get as close as possible. If you're way, way down on the CTC curve you could as well ditch mastery for avoidance, but even a CTC as low as 80% makes this advice a bad one. If you can somewhat reliably block, then having access to an active block-bonus will be better for you.
If you're below 70%, though, stacking MDR should be better for you, and that means stacking avoidance up to some 13% dodge and parry is better for you. Thankfully the gear where you gain from stacking avoidance is quickly replaced. Napkin math has gear as low as ilevel 346 favouring mastery stacking.