The silver stud cuts down MP by 50%, but the golden stud cuts down MP by 75.

My final party consists of Magus or Chrono, then Frog and Ayla. Have Crono/Magus cast Luminaire/Dark Matter, then Frog and Ayla use double techs, also using the heal double tech when needed. Don't be afraid to use elixers or other healing items as well.