ModBus control MPPT SmartSolar

Hi, I have a question about controlling the system with ModBus external device. I have larger system doing mostly off-grid, whole house is monitored and controlled with loxone smarthome system. I have here 3 mppt SmartSolar controllers, 3 MultiPlus 5kVA in 3-phase system, LiFePo 35kWh battery and 16 kW SolarEdge SE16K. I am using ModBus to control SolarEdge and Victron, but also there is a control from Victron ESS with frequency shifting. Everything works fine, until the BMS starts to reduce charge power, then victron starts to reduce power from SolarEdge and prefers power from MPPT. This I problem because I am losing power on AC side → when there is fluctuation in AC power consumption, MultiPlus is overloading, even when the SolarEdge could provide enough power for whole consumption.
I would like the system to prefer SolarEdge power to eliminate MultiPlus overloading. Is there anyway I can accomplish this ? I ModBus registry, there are no registr for control the mppt charge current.