To reach the 32 mhs hashrate with 1660 super gpus with hynix memory you don't need to overclock the core, just set the memory to -502 and powerlimit to 62%.
Thanks a lot, having 31Mhs and 49C on my Palit card. Seems like power limit has no affect on perfomance, only on consuming energy. But I really don't understand how it's works - why lowering consuming energy makes no difference to hashrate?