16g cutspeeds and definition

i am looking to see what kind of cut speeds amperage and air pressures yall like to use on 16g steel. i have been playing around with different speeds and setting, but i just cant seem to get rid of the melted hard spots and mainly just too much hard slag. certain corners and points will have melted dots that i have to grind off. i have also been battling to get good definition on small features. is it best to slow down? for example, letters under 1" should they be ran at a slow ipm. sometimes on a peice where i have hard slag, some portions will be perfectly clean on the cut side.
i have been generally running around:
.1 pierce
i have been running my 65sync in the mode where it shows the psi on screen.