There's been some great comments about echoes, puns and reading style in the recent posts here, here and here. Worth going back and reading, even if you already scanned the original posts.

I did want to address one point for the purpose of clarity. I'm not death on all echoes as some matter of principle, only accidental ones. Deliberate repetition for purposes of rhetoric, prosody, emphasis, dialect, etc. is just fine. I do it frequently myself. Repetition is a tool like any other tool, but like any other tool, when it is misused the technique becomes distracting and detracts from the text.