Beware of Focus & Concentration. Last Friday I used it to Focus on work, however my mind went to some story ideas. The rest of the day my mind kept jumping to those stories. So I had a low production, but that is ok.
I do not think you can expect a Paraliminal to work on single attempt all the time. There could have been interference from other soure causing the Paraliminal not to work for you on that day.