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For information about BT audio latency, please refer Minimum BT Audio Latency with A2DP - KBA228264
In WICED, BT/BLE scan, connection intervals are defined in wiced_bt_cfg.c. Also, Latency Number for BCM20732/20732S for Android/iOS? this thread might help you with some theory regarding timings.
I will try to get more information internally about the latency conditions you have mentioned and update you soon.