change 2.2uf 275 v to 1uf 400v , 2.2uf is bad start for your circuit, too big in rush current, i think D3 is refer to aux supply, ok here if you have external supply 12vdc put it there or clamp with big resistor from main after rectified with 40kohm 5watt, the aux supply is overkill without current limit resistor 100 ohm 1 watt at least, 56k 2w clamp that resistor cannot stand for a long time may burn, to power up ir2153 need small current 5ma only, R2 and R3 neex 1n4148 each gate, and from the rt ct ur setting i can see you will have arround 60-62 Khz, if ur using EE35 from PSU, primary winding will be 46 CT, means 23 each side, do not wind secondary winding yet, just start with primary only and add rc snuber to primay pin 1 (start) and pin2 (end) with 100 ohm 2w and 680pf. do what i say, ill draw some circuit for you easy to understand.