Update on my Parameters:

Without changing my mechanical configuration, i am now able to print with 50mm/s solid, after i dialed down the Acceleration-Seting in the Printer to 500.
The starting-value was 3000.

500 is the lowest possible value and i am currently testing, how high i can set this.
But even with 500, it prints very fast with no loss of reliability.

If someone else got decent values, please post them.

I will make an update, if i have a final value.