Use Performance Institute more than once per week in Superstar mode: use the Performance Institute on the day of a game. Save the game to a memory card, then remove the memory card. Next, simulate the game, then exit the game without saving. Insert the memory card back in and load your superstar. You will be able to use the Performance Institute again while still retaining the benefits gained from the last time you used it. Repeat this process as many times as desired to raise all Performance Institute stats.