A klippy.log would help since it contains the interpreted config that you are using. You either can zip it, upload it to gdrive.
The settings that limit retraction velocity are:
[extruder]
#max_extrude_only_velocity:
#max_extrude_only_accel:
# Maximum velocity (in mm/s) and acceleration (in mm/s^2) of the
# extruder motor for retractions and extrude-only moves. These
# settings do not have any impact on normal printing moves. If not
# specified then they are calculated to match the limit an XY
# printing move with a cross section of 4.0*nozzle_diameter^2 would
# have.
And if you are using firmware retraction (G10/G11):
[firmware_retraction]
#retract_length: 0
# The length of filament (in mm) to retract when G10 is activated,
# and to unretract when G11 is activated (but see
# unretract_extra_length below). The default is 0 mm.
#retract_speed: 20
# The speed of retraction, in mm/s. The default is 20 mm/s.
#unretract_speed: 10
# The speed of unretraction, in mm/s. The default is 10 mm/s.