Fixing com reclaim was a big improvement. Nowdays i think a reasonable air nerf is required. Kestrels shut down ground defences on their own. People usually go for bots, air x3 and tech. And spam even more air factories. And slammers can torpedo the kaijus for some reason, too. Another good fix would be to make minelayers act as engineer units for the purposes of unit selection if ordered to patrol (repair/reclaim) or lay mines. You dont want to interrupt these orders with box selection.