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2

A few things going on here. First of all -- voltage != efficiency (at least not necessarily). Efficiency is really a measure of total power output which is $I \cdot V$ (where I is current). Next, your 12V battery isn't 12V, it's got an operating range (from your link) of 12.6 to 8.4V, and I assume a typical voltage somewhere in the 11s. That means that based ...

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This is not a complete answer, but one generic technique for diagnosing differences between devices which should be identical is divide and conquer. Swap items until you see where the problem follows. For instance, if you swap the motors and the problem stays with the motor, you probably have a faulty motor. If a different motor with the same amplifier ...

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You can design, or purchase, a simple rotary table. I have used Arrick robotics over the years, and they have a relatively turnkey system for \$300 here: https://www.arrickrobotics.com/rt12.html If you are skilled at automation you could do this with a dc brushed motor and a platter, but it sounds from the way you ask your question that a turnkey system ...

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