Aren’t LRs and Lites both outputting the same dBm these days after regulations and a FW update a year or two ago?
@xrapidx, I would rather add another Lite for the dead area, and perhaps even reposition the other LRs for better overall coverage. Used Lites are cheap. In my view Asus and TP-Link/mesh stuff can’t compare… It’s consumer vs prosumer/enterprise in the Ubiquiti stuff.
You could also set up a Lite as a repeater if you don’t want to cable it in.
Otherwise what about a cheap R300 TP-Link range extender for the dead spot?