DH7 should be kept internal, at least at first. Being misinterpreted as trying to construct a straw man when you've been trying to do the opposite can derail a conversation. To actually believe that you've made a steel man, not a straw man, the person you're arguing with would have to admit that you've created a stronger argument for their own position than they could.
It's probably best to practice up to DH7 internally, and only up to DH6 vocally.
If we imagine arguments as soldiers, as they tend to be, the problem becomes even clearer:
(A and B are about to fight.)
A. Ah! My worthy opponent! I shall send my greatest soldier to crush you... GOLIATH! ATTACK!
B. His sword's a little wimpy. Let me give him a bazooka.
If I were A, I wouldn't trust that bazooka on B's word alone, I'd be annoyed at the slight against my blacksmiths, and, even if it turned out to be a totally legitimate bazooka, I would, at the very least, consider B a tactless grandstander.
(Though if the bazooka did work, I'd use it, obviously. I just wouldn't like using it.)
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I'm pretty sure it depends on who you're arguing with. If either of you is trying to /win/, rather than /find the truth/, then DH7 is tough to do. But if you and your interlocutor both care more about being correct than sounding correct, and you both respect each other, then you can and should attempt DH7 aloud.
I can respect the person I'm arguing with, and consider them to be truth-searching, and still not want to antagonize the part of their hardware that likes winning. I also dislike having my primate hardware antagonized unnecessarily; I tolerate it for the sake of truth-seeking, but it's not fun.
I see two likely cases here:
A) I come up with a tougher version of their argument in my head, in order to be as careful as possible, but I still have a good way to refute it. This is DH7.
In this case, announcing the tougher version doesn't get us any closer to the truth. A dead steel man is as dead as a dead straw man. I might as well refute what was actually said, rather than risk being unnecessarily smug.
B) I come up with a tougher version of their argument in my head, and I can't actually defeat the tougher version.
In this case, I definitely ought to announce this problem.
But this is not DH7 as posted. This is my actual purpose in making a steel man - the possibility that the steel man may actually force me to change my mind. I'm not trying to argue with my opponent on a higher level when I do this, I'm trying to argue myself out of being cognitively lazy.
A good rule of thumb: DH7 should be really really REALLY hard to do well if you're arguing with reasonably smart people who have thought carefully about their positions. In fact, it is so hard that anybody who could do it consistently would never need other people to argue with.
EDIT: In the interests of dealing with the worst possible construct, I should add:
A) In the case where openly announcing DH7-level arguments lets both parties see that they've misinterpreted each other, going to DH7 is a net win.
B) An expert DH7-level arguer may still need other people to argue with if they have been exposed to very different sets of evidence.
But generally speaking, the cognitive effort needed to communicate a steel-man version of someone else's position is better spent on expressing one's own evidence.