Barricade:

"Is it possible that my meals are so nutritent dense, that I really can go 10 – 15 hours without refueling?"

Absolutely!  Since you're not losing weight, your workouts are still solid, and your energy levels are good, what's happened is that your metabolic flexibility is sufficient to keep you running off stored energy, and your hunger has come into line with your body's nutritional needs. I'm extremely skeptical that you're only consuming 1200 kcal/day, though...you might try running a few days through fitday in order to figure out some rough calorie counts and macronutrient compositions.

As for myself, I've noticed that I'm happy to eat the same meals almost every day...apparently they're sufficiently nourishing that my body doesn't generate any cravings for anything else.  I haven't eaten breakfast in months.  Even if I exercise or work out, I'm not hungry until I come back, and sometimes not even then.  My usual meal is a late lunch/early dinner, and perhaps a smaller supplement a few hours later (I usually end up on a 16/8 or 20/4 IF).

Juicing along with your steak is an excellent option.  I generally fix my own meals with some veggies and eat a salad, but I've never liked vegetable juices. However you like them is fine.

Are you getting "enough carbs"?  If you're a powerlifter, your carb demands likely aren't very high: low-rep powerlifting is mostly dependent on phosphocreatine.  If you start doing high-rep work or "cardio" you might find yourself needing a bit more...but it sounds like you're well enough in tune with your body to know when you're feeling sluggish.  And juicing your veggies is going to get more nutrients out of them (including starches and sugars) than simply eating them raw. 

That being said, if you're curious, go ahead and experiment!  There's no permanent commitment involved with eating a few potatoes or a batch of white rice.

What you're experiencing is, I believe, one of the biggest benefits of eating like a predator: food no longer runs your life.  How you feel now is how humans are supposed to feel.  We're so used to planning our days around the logistics and social rituals of stuffing something in our mouths every few hours, that our days feel a bit "empty" with all the extra time...but those logistics and rituals are a consequence of eating a Neolithic diet of birdseed, not our natural state of being.

Think of it as a bonus.  All that great stuff you never had time to work on?  Now you do!

JS

Barricade:

There's plenty of information out there...what's lacking is concise, cogent explanations that are inspiring instead of discouraging.  I'm doing my best to change that.

I'm glad that my work inspired you to improve your life!

JS

(Postscript: Infinite gratitude keeps me emotionally healthy, and money helps pay my rent.  Sales of The Gnoll Credo and T-shirts increase the probability that I'll continue writing articles.)