I appreciate the sentiment, but I'd expect even with bad luck to be a bit closer and expect the spread to be on the whole a bit more random. It's consistently under target, within a specific realm 220-230k on almost every attempt.
It certainly can be due to small sample size, but it would be pretty unlucky considering my experiences. As I said, I've never gotten above target on any lengthy test, or even remotely close. Dungeon bosses are too short to consider reliable (6 buffs on pull 450k on boss is hardly consistent). So I'm hedging more towards:
A: I'm bad.
B: Something funky is going on.
That's why I'm interested to hear how others are faring.