Hey calaper...
Im no expert on triggers at all--never ever pulled one apart...
However my understanding is along the lines of...the spring will only affect the pull weight...
However "crispness" is more of a sear engagement thing(along with other mechanicals)
I think a lightened trigger would give the impression of it being crisper, but at the end of the day, (for examle) if you have creep, the spring will not take it out--rather you're less likely to feel it, or you'll pull through it quicker & easier...
Thats how i interpret what i dont know anyway...

Im sure others will give you a correct rundown...
But just get it mate...!!
It aided me in releasing some real good shots on a rifle im not familiar with, ive little doubt you'll be dissappointed...
The man who knows everything, doesnt really know everything...he's just stopped learning...