Your BH stroke is fine for me. Many club players have 1HBH as good as you have.
But if you want some comments, in my opinions are :
✺ You should turn your shoulders more, some instructor said turn your shoulders until you can show your back to the opponent. This will general more power in swing for 1HBH.
✺ Practicing by shadow swing in front of a mirror while imagining the ball coming, when the ball bounces you swing, may be help your late swing.
1HBH, right-handed, counter-puncher.