So just when one thinks you know it all, along comes Dave and teaches us about edge of cloud effect. That's very interesting and thanks for that.
This is why I design our systems to operation in the middle of voltage range, 370-425 max, 3 years in and we seem have got it right.
This
You need to keep Voc of the strings below the PV Input Vmax of the MPPT.
This is because the way the inverter reduces the power
Solar panel design
Fortunately Isc is pretty much a hard limit as to what a solar panel can generate.
Dave A Today, 02:36 PM(And I stress generate as opposed to pass through...)