One of the first things I would've done here would be a load calculation. The 100 amp upgrade may not have been enough. Another concern is those green glass fuses. Usually they are the old 30 amp stop-gaps that people used for nuisance blows, under protecting a 15 or 20 amp circuit. This always gives me the heebie-jeebies. I see there are some type-s sockets in there, which is good for preventing that type of shenanigans.