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BQ25505: BQ25505 - operation with faster MPPT update rate

Part Number: BQ25505
Other Parts Discussed in Thread: BQ25504

I have an energy harvesting application that requires an MPPT update rate faster than once every 16 seconds. I am using a BQ25505 and forcing a faster update rate by momentarily disabling & re-enabling the chip at regular intervals (typically once every few seconds). This seems to work except that BQ25505 is not controlling at the expected MPPT set-point. I have VOC_SAMP connected to VSTOR so I am expecting Vin to be ~80% of the open-circuit source voltage, but it appears to be controlling at ~50%. I would be grateful for any suggestions you may have as to why this should be.

Many thanks.