Echelon 4.0C vs Hellcat Pro

The Echelon compact has a .3” longer barrel than the Hellcat Pro. I’ve never realized why I shoot the Echelon so much better, I always chalked it up to the marginally longer barrel until today after the range cleaning my guns. I never noticed how much different the sights are. Is it possible this is the difference? I use the same hold on both guns but the Hellcat is consistently low. I wonder if I adjust the point of aim to “dot on the target” if it would correct this. On the echelon I use the picture above where the tops of the sights are in line. “6 o’clock hold” I believe?