Hi Leighton,
In your first post, you write that your firmware version is 0.2.3, which was released in early October 2019. From this, I think there are probably possible hardware bugs. What I mean? That some components have been incorrectly implanted on the originally designed panels, which will result in erroneous measurements at certain frequencies.
I am thinking specifically of C40, C42, C44, which was 100pF, but 100nF is missing in parallel. With 100pF and the coil in the power supply, approx. It resonates around 6.5 MHz. So you might also want to check out the hardware changes if your device was made more than a year ago. If you are interested in all of this, please check my web page for changes.
Note that if there is no interference at this frequency, it is not necessary to convert.
I wish you a successful use.
73, Gyula HA3HZ
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*** If you are not part of the solution, then you are the problem. ( ) ***
Gyula Molnar