You may think you filtered out people who failed your test, but you have no indication that that’s the case – you could just as easily have filtered out people who don’t like tests or people who don’t test well
I trust you’ve found some decent hires, but I’d suspect you passed on many as well
And, I don’t know about your work environment, but I’d prefer someone who can have a friendly conversation and do good work... I’m surprised you bothered giving your work-sample test to people who didn’t pass the earlier test