What can I do if my loco drives after conversion in the creep despite correct Märklin® Softdrive C-Sinus Motor settings?

For ESU LokSound V3.0 M4 and LokPilot V3.0 M4 decoders forward and backward trim must be enabled, both should be set to a normal value (e.g. 128), otherwise the locomotive runs only in the creep despite max. speed is set with the Märklin® Softdrive C-Sinus Motor.