To me it sounds like you get overly excited once you attain lucidity and end up losing it. The 'problem' you're suggesting is more simple than you think to solve.
Take off this pressure of 'having to LD every night', because you're making it the desired end result. You just have to focus on what would be fun to be doing inside your dreams.
For example: Instead of using the mantra "I will have a lucid dream tonight", use this "It would be fun to dream of myself inside of a spaceship tonight".
(Visualization goes hand in hand with this also)
Take off the pressure and add up the fun, if your brain doesn't work well with the stimuli you're giving, then it's worth a shot trying to get it another way!
Sleep on
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