400kHz may well be too fast for the 2113, the gate drive may not be up to it at these frequencies, you would need a discrete buffer between the 2113 and the fets, and a very well designed high speed, low impedance turn off gate drive (12V to 0v in <40nS) at this freq of operation.
Also unless you have an inductive load allowing zero volt turn on of the mosfets then the hard switching losses in the mosfets will be quite high, possibly leading to their destruction at high loads, this is not a trivial design.
Regards, Dr. AC. power electronics engineer.