[MENTION=516719]Ugly Dwarf[/MENTION]

You should be able to record your ride with map and other data from the app of your choice, and have that recording sent to Strava.

Try Samsung Health. I don't know if it'll work or not, but in the S4 days it could see an ANT+ power meter.

I think it makes sense to measure your complete power (so L+R in your case) for a lot of reasons. Sounds like your split gets more pronounced when you're working harder. If you were only measuring left, your total power would be off by double the difference in balance (because it would double the left reading). Also, it's useful for some kinds of injuries. I got a horrible case of tendonitis last summer, worse in one foot, I'm finally getting close to healed, the L/R split is changing in real time as I heal.

It's better to be able to test ideas out and see for yourself than to take some random person on the internet's opinion. As far as pedal in a circle, if it was me I'd use total power to tell if it's working or not. It's your power output that's important for speed, fitness, and even calories burned. If you're able to change something and produce more power, especially at a lower heart rate, you're doing well.