Nice Wellie, everyone should practice with their weapons to get to know them well.
In a picture I can see you were cocking the revolver manually, were you using it always in single action?
How do you find the trigger pull in double action?
If you look at the target you'll notice that you shoot to the left, that could be two things.
1 - Usual drift because you can't use your left hand to hold the gun, that is common in revolvers, although a stronger grip will help control that.
2 - You find the trigger pull too hard, and you are doing the pull not perfectly straight back so you end up torquing the gun to the left, that's a common error also when shooting Glocks, that's why I know about it.
To solve that cheaply, you can get a few caps and run dry fire drills to get a stronger finger and a straight pull.