Leisure is hooked up to ip65 all the time.
BM2 sends me notifications showing a constant drop in % on the starter?
Ignore the SOC % from the BM2 - i just switch if off in the settings.
as that unit of value is guesstimated by internal software and is a guess based on older SLA batteries.
what's important is the general trend of the voltage of the batterys. . .
you can see that your IP65 EHU charger is keeping your Leisure battery at 13.2v - constant. (which is set via the settings)
and that the AMT12 was keeping you starter battery at 12.6v - constant, which is exactly what it is supposed to do.
so there is no need to connect the Optimate to the starter, everything is working correctly.
12.6v/12.8v is perfect to float charge the starter battery . . . . it doesn't need to be over 13.0volts
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here is a victron demo for the ip65 settings. ( you can see its float setting is 13.8 - 13.2v )
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and the AMT12-2 shows that it will keep the starter at around 12.6v . . . so below the IP65 charger float voltage, but perfectly fine.
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FWIW . . .
if your AMT12 wasnt connected that starter battery voltage would drop below 12.0v after a week of not driving . . . then would continue to drop in voltage till after a bout 3weeks it wont start the van.
so you can see your setup is working correctly.
(just dont pay to much attention to the Bm2 SOC reading)
