I may not have written correctly
The slower the switch-on is turned on, the bed bends more.

Increasing the frequency of inclusions - will reduce this problem.
but there are long off bed

m307 h0

[[language]]
Heater 0 model: gain 48.1, time constant 109.1, dead time 0.7, max PWM 0.30, calibration voltage 24.5, mode PID, inverted no, frequency default
Computed PID parameters for setpoint change: P578.4, I66.185, D283.4
Computed PID parameters for load change: P

There is the problem of curving the bed when heating is turned ON-OFF-ON-OFF… etc.
The video is not mine, but completely reveals the problem
77.39.7.150\image\data\0\23681145_376806942759407_7602474108311306240_n.mp4
I made a quick turn-on and off-a little solves the problem, but there are often pauses and the bed bends.
The LED on the solid state relay flashes
77.39.7.150\image\data\0\47b5eda4-0caa-43f4-bbb4-516eb1ad7c4d.mp4
how to remove these pauses?