It works well with their PC app. The IN2Power has to switch to 50Hz mode for it to work. "High Speed" or "Advanced Mode" has to be selected in the app.

The OCA line shows up for me but changes based on the riding I'm doing. Climbing vs Flat/TT/Tempo show different 'optimal' chainring positions. I kind of expected this... but how do I apply that to ring positioning? Sticking with round rings for now.

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Shane Miller - GPLama
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I used the pc software now but I get the same angle. The powermeter has the latest firmware and I calibrate it before the test.

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Follow my project on Project 100 miles / 4 hours

Don't know if it's too late for this response, but OCA = 283º sounds like the origin of the angle is rotated by 180º. Which firmware version are you using? I think updating the power meter to firmware 1.058 (if not done already) and calibrating again making sure it's the left crank the one is down when you press the calibration button and not the right, should solve the problem.