How skilled are you with stones?
If not just get the Cylinder & Slide drop in hammer, trigger, sear sets.
I avoid and swap out all MIM parts when I can for forged or barstock parts, not cheap but I figure my life is worth it.
And I’ll bet dollars to donuts your HTS is all MIM.
Go with the standard Beretta spring, its 90% of a pro trigger job in the Berettas.