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the FW-190 had an all in one control. Not separate levers. You could not maximize it in the air.
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It was actually much more precise in most things than a human pilot trying to move separate levers watching gauges.
If you read the NACA evaluation, it was spot on. The only portion of flight it was not was if you pulled the lever to idle and descended. The system did not read density ratio as good in a descent because of the speeds of diving. The KG went to more a mechanic recipe system like the Bf-109. The only effect was the supercharger gear changeover was not always smooth because the gear had a wide range of RPM the Kommandogerat could select to enact the change based on the density ratio of the atmosphere. So it was very efficient in level flight or a climb when the aneroid wafers were functioning.
In a power idle descent, the supercharger gear change over could occur at high rpm or low rpm. Sort of the like a manual transmission changing gears early or late in a power idle descent. Of course if you were not at gear change altitude, it made no difference at all.
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Merlin ran on the ragged edge of detonation and over.
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When an airplane engine experiences detonation, there is no doubt in your mind what is going on.
https://youtu.be/Z1eOp_4godQ?si=JLqMucCPq57WICOx