If you turn on the top left MOSFET and the bottom right MOSFET you short out the power company.
You want to turn on the top two MOSFETs then turn them off. Next the two bottom on then off.
I think what you are trying to do will pull 60A off the 220V power line. I do not know what transformer you have but with a 55V output you will get 240A more or less.