Hi. Thank you. I have recently been preoccupied by the notion of misplaced modifiers. Many grammar sources seem to recommend that in the cases of participle clauses modifying an element in a sentence, the participle clauses be as closely as possible to the ones they modify.
I think that if you add more adverbials, of course they affect the positioning of the others; I think that adverbials commonly modify the whole main clause; I think that what I said about the original sentences holds.