Multi RS 6000 does not charge at maximum power when using DESS

Situation:
Running 3x Multi RS Solar, firmware 1.22 and cerbo firmware 3.60~58.
When the Multi-RSes are charging the batteries from grid using DESS setpoint (target battery %), I have noticed that the Multi-RSes do not charge at it’s full potential, but more like 95%, in this example the DC current is around 92A:

However as soon as I increase the minimum battery SoC to, for example 95%, the Multi-RSes are charging the batteries at 100% power, or more than 94A DC battery current:

I don’t really get why DESS is not loading the Multi RS to it’s maximum potentional, even though I have set the maximum charge power in DESS to 17kW (which is actually more than the system can charge):