I have dual sided pedals and can monitor both on my 830 (I will check on my son's 530 when I get a chance).

My imbalance is not as extreme - 55/45 - and I've tried to "fix it" by watching the screen and adjusting my pedaling - it didn't work. It was impossible to try and figure out what was going on while tooling down the road at 20mph.

The adjustments come from a bike fit and in the gym. Then your pedals will tell you the story after the fixes.