Perhaps I played better, and I appreciate the assumption, but I don't think that's entirely it. It could be a playstyle difference too. In the 5 games the injured stack didn't factor into the game that much. I focus generating as much burning on the first turn when the risk of engaging the opponent is limited too because if I've stacked 2-3 burning on someone but the opponent can't reach the injured is wasted and I get a couple turns worth of potential value on it before the burning recedes. Most of the time I'm loading up burning on Reva herself which does injure her, but it also gives her several points of shielded a turn generally which mitigates the impact of any incoming damage. And when you pair her with the candles and other corpses she usually isn't that exposed due to her ability to hit at range. Of course if you stick her in the middle of a scrum where the opponent gets multiple activations to hit her the injured will make a bigger difference, but for me it's rare for an opponent to get more than 2 melee attacks a game on her. And even then I'm usually using "take the hit" from a shieldbearer or summoned ashigaru (with Toshiro).
My opponent usually takes a fire golem, Elijah Borgman, Iggy, and "the great" carlos vasquez among the other standard arcanist stuff (miner, arcane reservoir upgrade, multiple soulstone caches). The golem goes down in one round after its burning is stripped. Honestly Elijah Borgman gives me the biggest trouble.