The DA issue is all mental when you can do the follow-up SA well. It’s actually pretty typical for TDA shooters to yank the 2ns shot (1st SA) more than the DA. The big factor is anticipating the DA is the time it takes to complete the stroke
Here are a couple of drills that might help the DA shot:
A variation of the wall drill where you progressively increase the speed of the DA press. I like to execute a DA press then release the trigger out only enough to simulate a SA press. Don’t let the trigger reset to the DA point. This allows you to realize (and practice) the DA and SA transition. Don’t forget to manually move the decocking lever. Failing to do this sets you up for failing to decocker during live fire.
An up drill where you progressively increase the speed of the DA trigger press as you snap the gun up on target. You will be surprised at how fast you can manipulate a DA trigger and get hits. Start with a slow press and increase as you go. The goal is the fire the DA shot when the gun is on target without waiting on the trigger. The speed of snapping the gun up from low ready and the DA press are interrelated. The faster the up, the faster you need to manipulate the trigger.
Both of these drills are designed to make you NOT think about pressing the trigger. The more you think about the DA (or really any trigger), the more chances you give your mind a chance to screw with your results.