The Meditative Metronome Method
"Absorbing the Power of Perfect Time"
As a trained musician, you know you're supposed to use a metronome. You use it frequently, but if you're one of the overwhelming majority, you'll use it for a handful of consecutive days, notice massive improvement, then stop using it altogether.
Why? Well, because it requires discipline, and lots of it. And because those practice sessions are always of the brain-melting variety due to the intense focus required to mold your imperfect body and mind to the unwavering demands of strict tempi.
"How can I develop better rhythmic consistency then?"
See title for a clue. But to get straight to the point, try this;
Simply turn on a metronome set at 56, low volume. Just have it in the room, try to coordinate your breath with it; 2 in - 2 out, then 2 in - 3 out, etc. Stretching simultaneously works wonders. (Don't stretch? You NEED to be - followup article on that later)
Reasoning? You know that 60bpm (beats per minute, naturally) measures seconds. Let's assume we're comfortable with those, considering our familiarity with the unit of measurement. To venture below this BPM will gradually expand the lower range of your comfortable perception of time. It will also be soothing and relaxing to the mind, which will help to bring natural focus whatever tasks may be at hand.
Eventually, once you feel that you've thoroughly absorbed the feeling of this slightly broader tempo, we will drop another notch, down to 52. I recommend going as low as 44, but this can take time.
"Should I be practicing my instrument during this process?"
Entirely up to you. I am an avid supporter of mental practice, and often find it unnecessary to be physically with my instrument to reap the benefits of this style of practice, relying instead on internalizing scales and other relatively simple patterns. If you do decide to play, however, make sure that it is with the same kind of focus as with meditation, allowing each beat to work its way into your being.
Give it a shot - see what you think. If all goes well, you should come away with a sense of clean focus and general well-being. Good luck.