I do R&D for a living. There have been many times I thought "This Is It!!" only to learn new lessons (results weren't what I had hoped for). But, there have been many times when my calculations came in spot on. Of course there was the once (or twice) where the experiments exceeded my expectations. You are a "tinkerer", learning as you go. What I appreciate is that you are saving numerous others from the failures by sharing your results -- positive and negative. Thank you!