I didn't have the issue with my old Freedom 25 either. It started when I upgraded to a Freedom 30. The demand from the Freedom 25 was low enough that I was ok, and didn't exceed the Honda's output. But if you get a charger that goes over 100 amps DC, you will run into this issue. I have it, as do a couple of friends of mine, all using higher output charger systems.
Not sure which control panel you are using. Mine is the Basic Remote Panel, the one with a series of LED light displays and is not one of the Link Monitors. Check your control panel booklet for Power Share settings. The settings on mine are 5, 15, 20, 30 and 50 amp settings, if I remember correctly. The Power Share settings are on the right side of this control panel. I set mine on 20 when using the Honda, and never go into overload. I just have to remember to reset it to 30 when back at the dock. It is one of the nice features of the Freedom chargers. If for example, I turn on the hot water heater at the dock, the Freedom unit senses the 13 amp AC load and drops the charger output to keep from overloading the AC system of the dock.