@thestigh
If sensitivity was set wrongly, It might have possibility of not-distinguishing pattern of your voice. Too high sensitivity for model would make hard to catch your hotword, Too low sensitivity for model would make indistinction between hotwords and similar words.
Anyway, this issue about voice model and sensitivity is related to your environment of real usage , there is no silver bullet for common cases. Each case is different with others. So you need to optimize values of them to fit to your environment by yourself. Try many values and find optimized values for you.