It’s not documented, but we know the intent is that you should get more PvP points if you fight a “stronger” opponent. It’s been documented as a “tough luck” scenario that as you yourself get stronger, everyone else gets weaker in relation to you, so endgamers get fewer points.
What I think we’re seeing in situations like this post (and the larger thread):
Is that player level and guild statue completion seem to have a really large impact. I can’t find the specific thread right now but AWR is suggesting a guild should NOT complete all statues until towards the end of the week to maximize PvP score. IIRC several people responded to this with, “Well, duh”.
Found it: PSA - It's better to complete all tasks (LT) every other week thanks to 4.3
Completing statues made a 40 point difference per match. Imagine trying to keep up with a leaderboard player making 2x your score. The stat differences there do NOT represent that much challenge differential.
It doesn’t sound like a good or intuitive system to me.