So my orp climbed back up to over 380 after recalibrating on the 11th and turning ozone back on a few days ago.
Then this morning i spent about 10 seconds scrubbing it with a toothbrush. Now 4.5 hours later its sitting at 339. So it's looking like dirt may be causing it to read high. Possibly. Will continue to monitor it.
ORP readings are sitting at 366 mV today. Up from the last couple days but still not at my nominal value set at 370. At this point I'm still leaning towards the theory that a dirty probe leads to higher readings.
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