One extra tip ( sic ) is using a clean tip so wiping on the damp sponge before soldering is a good idea, but remember this kills the heat for a while so the tip needs to heat back up.
I have a soldering station, rather than just a gun on a cable, and have an adjustable temp, + LED temp readout, so can easily set temps, and can tell if it fluctuates when cleaning the tip on the damp sponge