So from asking around in some other places with some well informed people this is the best answer to my questions- Mark Gordon of SAC stated “Shooters, I spoke with Mats Lipowski, the CTO of Trigger Tech and asked him the same question. He said that the internals of the Diamond are held to the absolute highest standards. Not that the Special and Primary are not slackers, but the Diamond has exacting tolerances compared to the other two models. What that does it allows the Diamond to have less overall travel required to break the trigger, cleanly and safely. Trigger Tech has some documents that look like the picture I posted, but show the trigger lever travel in Inches and how much weight is required to fire the trigger. You will notice that the Diamond is a fair amount less travel required compared to the Special, even if they are set to 1 lbs of pull weight...”