Hi Rich,
It is a trade off. Look closely at your set triggers when you set the rear. You will notice that just as the front lever engages the notch on the rear, it pops up and then drops down again. That means you cannot have the front lever touching the sear as you might with a nice fitted simple trigger. That space between the front lever bar and the sear is necessary otherwise the triggers cannot be set when the lock is cocked to full. Consequently, you cannot eliminate all creep in the front trigger when used unset. The trigger bar has to travel that space until touching the sear. That gap gets larger the further back the sear is located relative to the front lever. Therefore, creep is greater as the sear is positioned back and less as the sear is positioned forward toward the pivot of the front trigger. The second thing to know is that the rear lever just has to hit the sear at any location along its top. It is fine if just the front corner hits the sear. The force it hits can be adjusted by the mainspring and its position is irrelevant as long as it hits somewhere. When I fit DST, I ignore the rear lever and just position the front trigger as close to what I would do for a simple trigger realizing I cannot eliminate all creep and the rear lever has to hit the sear somewhere along its top. I tune my locks so they have light trigger pulls and then position the DST as far back relative to the sear as the rear lever will permit. That allows me a reasonably light and acceptable front trigger pull without setting and still have the set function work properly.
dave
