where are you from, just so we know if you are under ipsc or uspsa rules.
replacing the trigger will do nothing to the trigger pull.
lighter main spring (13 if using federal primers on handload, 15 for averything else including factory) will lighten the trigger pull.
this will make a noticable differance and cost you bugger all. you can do it yourself in 10 mins.
next would be the comp hammer, gunsmith needed if you know know what you are doing. makes the single action very nice.
a few thousand trigger pulls will smooth things out a little too.