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TPS40180: TPS40180 PSEL setting???

Part Number: TPS40180

Hi, I am trying to use 4 x tps40180 parallel for high current application (like datasheet page 22 ), but I have problem about the PSEL setting. 

Condition 1:

Master PSEL: OPEN=8 phase CLKIO

Slave1 PSEL: 14.7Kohm=90 degree

Slave2 PSEL: 47Kohm=180 degree

Slave3 PSEL: 95.3Kohm=270 degree

Vin=12V, Vout=5V, Iout=60A

I found the switching node waveform of MASTER and Slave 2 have jitter phenomenon when output load between 20~30A. When the output current higher then 30A, the jitter phenomenon was disappear until to 50A.

Condition 2:  (exchange Slave 1 PSEL for Slave 2 PSEL)

Master PSEL: OPEN=8 phase CLKIO

Slave1 PSEL: 47Kohm=180 degree

Slave2 PSEL: 14.7Kohm=90 degree

Slave3 PSEL: 95.3Kohm=270 degree

There is no jitter phenomenon and converter is stable during 0~60A. If you change others angle either Slave 1 or Slave 2 or slave 3, system become unstable.

Does anyone can help to explain the design rule of PSEL setting for 4 x TPS40180 parallel? or share the design experience?