after trying several settings and mailing with the support (thank you), I found the right settings, to get WMS to work together with Toshibas' RV743-series.
If anyone could verify, that these settings are satisfying I would be very pleased.
Possibly the settings could be integrated in the programmes repertoire.
Unfortunately one issue left:
- Playtime will be displayed wrong on the TV when pushing the Info-Button on remote. (Displayed time will run about half as fast as real time passes)