If you are using a 40A breaker the EVSE should be set to 32A (80% of 40A). Actually the car's charger sets the current assuming there is enough available. A Leaf with the enhanced charger will draw 27.5A A Volt would draw 14A. My car has a Tesla Drive train so it can charge at 40A. Most other cars will draw 30A or less. My eGolf charged at 30A from a 40A EVSE connected to a 50A breaker.
2012 Cayenne Red SL traded for:
2013 Pearl White SL Premium
Traded for a Cirrus White 2014 Mercedes B (totaled)
2016 Urano Gray eGolf SEL w/ drive assist
Loved the VW but it sat too low for my old body
Back to a Cirrus White 2017 B250e