Tail current for Victron AGM batteries

DIY
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When my Victron AGM batteries were new I used 1%, so for your case 4A. Now they are 3.5 years old I have increased this to 1.2%, so 5A.

Also make sure the Charged Voltage setting in the SmartShunt is 0.2V below absorption. See

https://community.victronenergy.com/t/shunt-battery-monitor-jumping-to-100-or-reporting-a-high-soc-when-the-volts-are-low-and-or-the-bms-has-disconnected/88