I went thru a similar ECG problem a couple of years ago. "Poor R-wave progression". AME sent me to cardiologist, echo and stress test. I'm tall and thin and do a lot of aerobic sports. Cardiologist said I was fine, that "in my case, poor R-wave progression wasn't important". I'm just curious why sometimes the ECG comes up perfectly normal, and other times it shows this feature. One doc said that the "R-wave progression" had to do with the signal transmission thru my chest, and given my fitness and anatomy, it could occur. Anyway, relieved to hear about it being a non-issue.