I suggest you look at your gpu memory type using GPUZ software first, I find the 1660 super hynix version the easiest to config because you just have to reduce the core and memory clock using msi afterburner
Core: -500
Memory: -500
Power limit: 65%
Hashrate= 31.79 MH per second @74 watts
OP If your card has hynix, this is the best settings.