Well the magic is over... Pretty much back to normal workouts.
Tried a pop tart 20 minutes before squats this morning

. Decent workout, but nothing special. Going to try a vitamin water before tomorrows run.
Yesterday I had broccoli (500g) and steel cut oats (100g) about an hour or so before my run. Terrible heaviness of gut during run.
Really made me aware of 'digestion' for the first time. I recalled, from meadows' article, how digestion requires blood.
As the run went on, the heaviness in my gut subsided, seemingly in correlation with increased sensation in my legs. Interestingly, the total time of my (fixed distance) run was 36 minutes -- exactly the same as many other occurrences which felt much better.
After the run, I felt very anxious and depressed for a while, but held off eating just long enough... After a few hours, my head cleared and I felt light and energetic.
I wondered if this was the point that digestion had fully finished, leaving blood to return to my brain and muscles. I've noticed this ’light and empty' feeling before, and it usually precedes good workouts (sweating, heart rate, pump, respiration).