Can't drive high side igbt properly

[abfer]

I implemented a 3ph inverter using six igbts. (600V 20khz rated). I drove an ac motor via this inverter. I'm looking at high and low side waveforms. They are good when i don't apply DCBus voltage. When DCBus is online, high side gate waveforms are distorting and nearly disappearing. Low side is ok. My gate drive IC is IR2113. I tried several bootstrap capacitors from 10uF to 470uF. Nothing changed. I tried 3 different DCBus voltage. 530VDC, 300VDC and 35VDC. System worked with 35VDC and motor revolved.But the other choices didn't allow it to run. When i cut off DCBus but continue to make switching motor a little rotates at the end of the voltage decreasing period. This shows that, at high voltage driver can't drive the high side. But i implemented the driver according to the datasheets and application notes and saw similar drivers that are operating with small bootstrap capacitors. What may be the problem? Any ideas? I'm driving the bridge with 10KHZ center-aligned PWM.