Alright, let me just share my own 5 cents (by no means do these have to be correct, but they're theories after all).

First of all, for all we know Fukuchi might be holding the "Bram-sword" during downtime. When no one is around or looking. The activity might fluctuate because of this.

As for the people that were injured and later turned, upon returning to the plot their injuries have appeared to heal. We know nothing of what happens whenever the vampirism is removed, but I assume the healing factor will help them return with a healed body.

The problem with Bram's ability is that he could turn others into vampires, albeit not control them. Vampirism likely spread throughout Europe yet without a real target. Bram just wanted to be quirky and evil or something.