I realized (in both senses) several ways to improve my omega-3 self-experimentation:
1. Simpler treatment. I had been drinking both walnut oil and flaxseed oil. For the sake of simplicity, I stopped the walnut oil. I continued to drink 2 tablespoons/day of flaxseed oil. I will vary the amount of flaxseed oil.
2. More controlled measurement. Instead of balancing on any part of my right foot, I started balancing on only the balls of my right foot.
3. More measurement. I measure my balance once/day. During that one session I had been measuring my balance 20 times (measuring how long I could stand on a platform before falling off — 20 durations). The first 5 durations were warm-up, leaving 15 durations that counted. I increased the total number of trials to 30. It was still easy; the whole thing takes about 10 minutes.