@phaedrux
While treveling from Probepoint 1 to P2 (or P2-> P3 or P3->P4) Z moves down simultaniusly.
now I use
; bed.g
M150 R145 U40 B0 Y1 S1 F0
G28 XY
G1 X10 y10 Z5 F30000
G30 P0 X10 Y40 Z-99999
G1 X325 y10 Z5 F30000
G30 P1 X325 Y40 Z-99999
G1 X325 y300 Z5 F30000
G30 P2 X325 Y330 Z-99999
G1 X10 y300 Z5 F30000
G30 P3 X10 Y330 Z-99999 S4
M150 R0 U255 B0 Y1 S1 F0
it works better, but not as supposed in the tutorials