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I made SMPS for a car amplifier, but there is un expectable spike on it this is the waveform at IDLE 1A load heavy loads (<3A output) this is data of my transformer can u pleas tell me ,what is the reason of that matter.and what do I do to resettle this , thank you.

power amp -2*TDA7294 70+70W class AB SMPS IR2153,IRF740 EI40 70khz audio processor TDA7315 microcontroler PIC16f887 - mikroc PIC compiler http://www.youtube.com/watch?feature=player_detailpage&v=UBRua71VcLQ http://www.youtube.com/watch?feature=player_detailpage&v=D0J3rIhycso

POWER SUPPLY power output (230W - 270W) driver - sg3523 SMT(PUsh and pull) primary switching fet -(2x) IRF3205 core(EI33 PC40) switching frequency - 100khz pulse width 45% working voltage - 9v-16v output voltage - 36V regulated (unregulated 42V max @13.8v input)