Maybe the game doesn't factor in lower ranked players but at high, there is little difference between two players with 4k difference. I'm at about 270k, I encounter players with 50~100k plus or minus power difference all the time.

You always have the composition advantage as you can change your team however you want before the match, so take advantage of that and you'll be able to deal with players that have stronger teams by taking advantage of elemental/type weaknesses.