What is the most powerful "subconscious mind power technique" in existence? You are saturated with this power! Really. That's like asking a fish his opinion of which water-breathing technique works best!
So-called mind power is usually associated with those people who, like a Tony Robbins or Oprah Winfrey, have the intensity of purpose and sustained focus to not only help themselves complete any given task, but to burn ever so brightly while doing it.
The fact is, everyone has this capability. But very few allow themselves to get clear enough about their purpose, or have a good enough reason to focus. Let me illustrate ...
Consider this thing we call "light." Light consists of photons which, depending on when and how you look at them, can be considered either a particle or a wave (some consider them a "wavicle"). Light, however, has very different qualities in different circumstances. A candle is a very inefficient form of light; a laser is very efficient. Both sources of light, however, consists of the same photons.
Want to know what makes the laser so powerful? Order and coherence. When just 1% of the photons line up in a sequence, this affects all the other photons and prompts them to do the same. The result? Massive coherence that can burn a hole in steel! This is the same coherence that is also present in other materials and states, such as in high-intensity sound waves, super-fluid helium, and your own brain waves during meditation!
The fact is, the most powerful subconscious mind is one that is lined up (at least 1%) with its conscious mind to create a power that is unstoppable. The problem lies in the fact that, subconsciously, we have different priorities and hidden agendas and survival decisions than we do consciously.
Hidden decisions are usually beyond conscious access, and are based on influences ranging from childhood traumas to something called "epigenetics," the study of inherited thoughts and behaviors. These hidden decisions often act contrary to your conscious, expressed desires, creating a mind fog that clouds your ability to see the world in an orderly manner. And no orderliness means no power.
The most powerful techniques, therefore, would be ones that naturally align subconscious decisions and priorities with conscious ones. Coming at this from a conscious mindset, however, like in hypnosis, affirmations, tapping, or some other alignment technology, does not usually satisfy the needs of both the subconscious and conscious minds simultaneously.
True subconscious alignment requires relaxation, consistent listening, feedback, access, communication and resolution. Meditation does this, but can often take years to bring about tangible results other than relaxation. Inner child work also does this, but usually doesn't resolve the issue since it doesn't involve epigenetics.
The only effective method to open the pathways to subconscious power is to therefore establish instant feedback between the conscious and subconscious, integrate this with conscious understanding, and request the subconscious change the hidden decisions that conflict with conscious decisions. The Logical Soul(R)does this, usually within minutes, has a proven track record, and can be learned.
Your subconscious power is there, waiting for a simple alignment. Let it happen.