My first reaction to this is to suggest that for a while, instead of doing strength training and worrying about breathing, reverse it -- concentrate on BREATHING while doing activities like strength training (in other words, make the breathing the focus, and don't concentrate on improving the strength training until you're satisfied that the breathing is supporting your rhythm properly).
If you go back to old habits, focus on the breathing again INSTEAD of the strength.
What do you think?
God grant me a good sword and no use for it. -- Polish proverb