The cost of vagueness
Words like some, various, appropriate, properly and etc. read as instructions but carry no information. The model still has to act, so it guesses — and its guess is an average of everything it has seen, which is exactly the generic output you were trying to avoid.
The swap
Trade each hedge for a number, a name, or a rule. 'Keep it short' becomes 'under 120 words'. 'Some examples' becomes 'exactly three examples'. 'Handle errors properly' becomes 'return null on a parse failure and log the offending line'. Deleting a hedge without putting a fact in its place just leaves a shorter vague prompt.
When vagueness is right
Leave a term open only when you genuinely want the model's judgement, and say so: 'pick a tone you think fits a technical audience'. Deliberate latitude reads very differently from an unfinished sentence.