Well that SmartShunt will never set to 100% when the battery is full, the tail current in the SmartShunt has to be HIGHER than the MPPT setting as it has to go below this value to reset. Change the tail current in the SmartShunt to 1.5% or 2.0%. Also for AGM reduce Peukert to 1.15.
Read this FAQ for info on how the shunt works to set to 100%.