OS 91 max fx - no smooth run at half throttle, however engines sounds fine in idle and high speed position

My engine runs very fine in idle and full open throttle Position, but at keeping constant half throttle the rpm changes when model is at ground (without dead stick).

Additionally I have recognized that when going from idle to full Speed it doesn´t hesitates.
And when I start flying I have recently dead sticks, especially after longer Periode flying with less than half throttle.

I have already checked the tubing the overpressure tank system, other props than 14x8, glow fuel (10%NM/ next try will be with 5%NM only) and plug (from OS#8 to OS#3).
What could be next to be checked?

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