Multi-mcu extruder not smooth

Under the same firmware,I use multiple MCUs, 1 main MCU to control the XYZ movement, another MCU is used for the extrusion of the print head, in the print the following file, found that the extrusion of the missing corners of the missing material, modify the PA value many times the effect is general, PA = 0.02 - 0.035, later modified pressure_advance_smooth_time = 0.04 - 0.09 test effect Obviously, but there has been a corner of the lack of material has been serious, cracking problem, asked whether it is synchronized extruder?
I also tested the same model with a single mcu, PA = 0.02 pressure_advance_smooth_time = 0.04 model is normal. How to solve this kind?

The red one is the optimal value to adjust pressure_advance_smooth_time to reduce the phenomenon of white picture if the PA value is certain. The white picture is the default pressure_advance_smooth_time = 0.04.


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