Having read all that, you will know about "area aim". Accept you're going to wobble and accept that the area you're happy with is on the large side at this stage. Once the sight picture is right (i.e. sights properly aligned and inside your area but not necessarily bang centre) gradually increase the trigger pressure until the gun fires as a "surprise break". It doesn't matter where in your area the trigger breaks as long as it is in your area. Statistically, the largest number of shots should go into the middle part of your area.

Try some dry fire practice against a totally blank wall so you're not bothered about wobbling off the black.

I'm reasonably good but I've gone off a bit recently. I've been taking far too long in the aim, searching for a ten each time with the effect that I've been getting some bad fliers. I need to go back to first principles.