0119R Adris Dream Soprano : Good low register, Bad high register

I bought the version after I bought the pearwood 4119R model which I enjoyed a lot. I intended to use this plastic one as a practicing substitute for my pearwood version. The exterior shape of the versions are quite similar. And the low register does not differ significantly. However, the high register of the plastic one is much harder to control and play in tune. I do not know whether it is a problem of the model or just the one I received. A little bit disappointed.

update 1 on 2022/7/23

With more practice and a smaller thumb hole, the high register is easier to control now. The pearwood version is still easier to blow, although. And, like the pearwood version, the sound of this flute is much fuller than my Aulos Haka.