That has made it a whole lot clearer. Can you please rewrite the last two
Hello again, John121: Let's look at the last two sentences again:
john121 posted: Wounding like an arrow, *he sometimes hated to hear the truth.
 Mentioned as constructive criticism,*there were no hard feelings.
In (4), the implied subject of "wounding like an arrow" is supposed to be "the truth." But I don't think we want our sentence to entail that the truth always wounds like an arrow. I might feel comfortable with the following revision:
(4a) Being capable of wounding like an arrow, the truth was sometimes something that he hated to hear.
In (5), "mentioned as constructive criticism" is a dangling modifier in the worst sense of the term: it doesn't apply to any noun phrase in the entire sentence. We have to supply a noun phrase to which it can apply. Here's a sentence that works:
(5a) Having been mentioned as constructive criticism, his remarks concerning imperfections did not engender any hard feelings.