These settings in the EYE sensor are for nothing, because the FMB920 configuration does not allow reading from BLE more often than 30 seconds. See the parameter "Sensors and Beacons Update frequency" on Bluetooth 4.0 tab.
I am currently testing the use of these sensors and I am also disappointed. Additionally, as you write, changing the angle (pitch, roll) takes place in 2-3 minutes. After this time, the readings are stable with the new position.