I may be the Lone Ranger, but regarding DA/SA dryfire, I would concentrate on the DA stroke and the SA press seperately rather than in tandem.
If you want to pin and reset fine - hold the DA trigger to the rear before you let the trigger return for another DA stroke. Rinse and repeat.
If you want to practice the SA trigger press, hold the trigger to the rear until you cycle the slide, then establish grip and reset and press. Or some semblance of that.
The the DA and SA trigger manipulations are obviously different, and my thought is that breaking focus in the middle (after the DA stoke) to set up the SA press doesn't give optimal results.
Another thing I sometimes do is after the SA press, I keep the trigger pinned and lock the slide to the rear, I acquire the front sight and let the slide go using my support thumb, I track the sight as it comes forward and dips, at the same time I reset and press as the sight raises into position. I think it works to help ME get on a good sight picture for a follow up shot quickly, even though in reality the sight moves up and drops back in, rather than raises up.
Teaching po po's transition trigger one of my favorite drills was to load a dummy, then a live, then a dummy, them a live until you end with a live round on top of the mag. The shooter than fires the live first round DA, follows the sight, resets then presses. Of course one object is a good sight picture for the SA dry press - which the student knows is coming, therefore should be correct. To me the overriding objective is ingraining a good smooth DA stroke during live fire - everybody has one during live fire . After a couple runs set the time to a reasonable par and work to achieve the SA dry stroke before the second buzzer. Probably repeat it move than you want.
One of my rules when using dummies with students for trigger manipulation drills is that the shooter always knows where the dummy is. I learned that at Bill Roger's place.