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I have tried several speeds, from 8000 down to 1000, and it doesn't make any difference.

Here is the starting script.
G28 X0
G28 Y0
G28 Z0
G92 E0
G1 X100 Y250.0 F6000 :go to front of bed
G1 Z0.3 F2000 ;set noxxle .3 mm high
G1 X200 E25.0 F2000 :extrude a line 100mm long
G1 X210 F180 ;wait for ooze
G1 X220 F6000 ;fast wipe
G1 Z5.0 F1000 ;lower bed 5 mm
G92 E0

Here's the ending script.
M104 S0 ; turn off extruder
M140 S0 ; turn off bed
G91 ; use relative coordinates
G1 Z100 F4000 ; Lower 100mm
G90 ; use absolute coordinates
G28 X0 ; home X axis
G28 Y0 ; home y axis
M84 ; disable motors
M107 ; turn off fan
M300 S2000 P1000 ; beep to signal end