I have had much lower raid teams kill off my much higher raid team. One was 395 with only one hero that won a LOT of my trophies and I have over 3500 power. How is this happening??? I also lose a lot more trophies than I gain !!! This is not what I read when first starting raids. Those within my power level, give or take about 100, would be competitive.
On the other side, I have higher scoring teams that kick my butt. This is expected since it does follow the rule.