To improve the J_C-B properties of FF-MOD RE123 thin films, it is effective to introduce the normal-conducting precipitate BaMO₃ (M= Ce, Zr, Hf, etc.) as an artificial pinning centers by doping elemental M into the starting solution. Furthermore, it has been reported that by co-doping with different M simultaneously, BMO having different lattice constants is independently introduced into the base material, resulting in refinement and better J_C-B properties than when single M doping. In this study, we combined this M-co-doping strategy with the introduction of Gd214 pin, which we recently reported its effectiveness.