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BLE Channel Map Request instant: programmable?

We're using the CC256x in dual mode. We are using a 7.5 ms connection interval between our master and a slave. We sometimes see the slave disconnect when the master sends a Channel Map Request. Using a PA, we see that the "instant" value in the request has already passed by the time the slave gets it, so the disconnect is per the BT spec for this scenario.

We prefer not to disable BLE channel mapping. One suggested alternative is to use a longer connection interval (not an option).

Is there a way to command the BT device to use an instant value that is more than the BT spec's required minimum of 6 into the future? Perhaps a Vendor Specific HCI command? Or is there another alternative?

Thanks,

Chas