There is an ongoing problem with queen introduction - the very existence of this thread confirms that. Will a recommendation to "do as I do to achieve the same percentage results" help ? Sadly, despite the good intentions of doing so, I suspect not - for in my experience people only 'read the manual'/ seek advice etc., after they've screwed-up. In such an event, the statistics of an experienced beekeeper's success has little relevance. Wish it were otherwise.