Great you both agree with the idea, and how it can be beneficial to improving your dance. Do you have ideas for practical implementation in tango?
I can't tell you how to practice, because the practice has to specific for the specific problems that you are having, and I don't know you as a dancer. The literature suggests that you would have a teacher or expert to help you identify problems and suggest drills for you. Lacking that, you'll need to do it yourself.
Here's a method:
1) Identify a specific problem that you, personally, have.
2) That should lead you to a skill that you personally should improve upon.
3) Devise an exercise/drill that will focus narrowly on that skill and do the drill.
4) Notice how you do each time you repeat the drill. If it does not work out well, identify why not.
5) Make a correction and do it again.
6) If you do it well, recognize the success and congratulate yourself, but keep practicing.
If your drill/exercise (3) doesn't prove effective, then you need to get more granular. Zoom in and get more specific about what the problem is. Do the method again from the top, but revised. Keep drilling down until you get to the core problem. You have to identify the problem before you can work on it.
When I was a child I took music lessons. I was supposed to play every exercise for that week – maybe 8 of them - three times, by the end of which my 30 minutes would be expired. I did that, but made meager progress in retrospect. I wish I would have know that if I had a problem with only one phrase, I could practice it 16 times in the same 30 minutes. If I had a problem with a certain measure/bar, I could practice that 96 times in the same time. If I had a problem with the transition between two specific notes I could have practiced that 386 times in the same 30 minutes. If I had understood the value of deliberate practice I would have made orders of magnitude greater progress than I did.
The whole idea is to focus your attention narrowly. That skill - focusing your attention – is, IMO, one of the most valuable in dancing Argentine Tango.