I don't know the hex address for the my player save, but you can use cheat engine with the game running. You can find an entire table that can be loaded into cheat engine that has many slider addresses here -
viewtopic.php?p=1507648#p1507648. One post above it shows what values to use so you change the sliders to appropriate in-game values.
Once you apply your change, you can save your my player game and don't have to change it again.