Hi Arno,
Are you sure your changed parameters have actually been saved to the controller?
The icons can be a bit misleading:
The configurations shown in your last post appear to have the
Throttle mode selection set to
0:Hyperbola ("Reverse - Neutral - Forward" boat type throttle) instead of
1:Linear (zero to maximum rpm).
If the controller has not saved the shown Throttle type correctly, I'm concerned that it may not have saved the
Forword speed ratio (%) to the 100% setting shown.
If the settings have definitely been saved, which can be confirmed by reloading
(Uploading) the settings, perhaps the power to the controller needs to be cycled before any changes in the settings can take effect?
My only other thought is that the
3-Gears enable function may select the Default gear setting when the function is disabled.
I would set the Default gear(0:HG 1:MG 2:LG) setting to 0
(High Gear) for maximum speed/power.
If the 3-Gears setting only affect the forward speed,
and the default gear
(currently set to Medium) is automatically selected when the
3-Gears enable parameter is set to
0:Disable, this might result in reduced power pulling away in the forwards direction, but not in reverse.
If you are using a typical Hall Type throttle, I recommend that you set the
Throttle voltage range protection enable setting to
1:Enable and then reset the throttle voltages to the default values shown below:
Failure to utilise the throttle voltage protection with the correct settings could result in the motor being stuck at full throttle
if the Ground wire going to the throttle had a poor connection, or somehow broke or became completely disconnected.
Alan 
