It's not the stems that make the difference, It's the Housing.
What you really want is the Vintage mx housing. It could be blue/red/green/ ANY COLOR
I've tested this extensively. In a well worn housing, even if you put a new stem in it's smooth.
In a brand new scratchy housing, even if you put in a worn vintage stem, it still feels scratchy.
Quick reminder: Desoldering is VERY treacherous, Most of the time, newbies think they're doin it right. But they're actually Way overheating the switch.
As the copper gets hot, the plastic which holds them in place become soft, and can MOVE. So if you put pressure against the pin, held long enough (could be less than 1sec), it could very well cause the switch to deviate from spec.
Always desolder 1 leg at a time on ALL switches, then go back after the switch has cooled, and do the other leg. This is much safer than doing both legs at once, again, More heat for longer , the worse it gets.