Turbo Muin Smart+ unrealstic values

Hello,

 i´ve the Elite Trubo Muin Smart+ (Serial >30000). The connection with zwift was very less stressfull - thats good. Manual for this: https://support.zwift.com/hc/en-us/articles/204993089-Setting-up-an-Elite-Turbo-Muin

But my actual problem is, that the values (speed, watt) during a ride are not realistic. I drive with 160W and 90 rotations over 30 mph.

Is this a configuration problem in zwift or has the turbo muin a variance more then 20%?

Do you have any ideas or suggestions?

I´ll try this later:
https://support.zwift.com/hc/en-us/articles/206622416-Resolved-Turbo-Muin-Smart-B-Gives-High-Readings