I think the latest firmware is 7.3.1.0, so you could try updating that. It’s very easy with the Silicon Labs flasher add-on, which defaults to the SkyConnect latest version.
Otherwise, I believe Hue bridges have a much larger antenna that it’s possible to fit into a SkyConnect dongle, so it may be that this was masking weaknesses in your zigbee network. I notice that you only have one router device in the same room as your coordinator, which means that a lot of traffic will be passing through it now - before, the Hue bridge may have been connecting directly with devices in other rooms. Maybe try moving the Woolley smart plug into that room to see if it helps? If it does, a “repeater” router in that room might do the trick.
There’s a very thorough discussion of how to achieve a robust network here: