Don't do them if you're still sore. Your body is telling you something with the pain. You are probably breaking down somewhere in your form to have this pain. It could be a very minor flaw in your form. Wait till it feels better and start some GMs. The best thing you could do is post a video of you deadlifting with heavy weight..after your back feels a little better. You will get a great critique if you do that. Just doing good mornings won't fix your form while deadlifting.
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