This. I’d avoid using the hardened nozzle until you have a filament that requires it (glow in the dark, wood, CF, etc). Between the part cooling fan and the poor thermal conductivity of the steel (assuming you do have the nozzle fully tightened), it’s an uphill battle. If you really need that nozzle more or less permanent, try using an enclosure to keep ambient temps up, but note PLA doesn’t necessarily do well in enclosures that get too hot