Looks like you haven't had a reply for a while. As far as the car is concerned it doesn't matter what amperage the EVSE tells the car. My 2016 and 2018 Soul EVs both charge at about 10% below the current specified by the EVSE so the 10A EVSE will have the car only drawing around 9A and the 12A EVSE will have the car drawing around 10.8A.
I have charged the car at 6A up to 28.5A on 120V. Note that this was a custom EVSE as the J1772 spec is to only report 16A max on 120V. This spec is only because most 120V outlets are either 15A or 20A. As I understand it, the Soul EV is one of a small number of EVs which will charge at the OBC's max current on 120V. Do not charge at a current over 80% of the circuit rating.
Long wait for potential 3rd 2015 Kia Soul battery replacement