About 3 weeks ago I had strained my left deltoid towards the top of my rotator cuff. If I plan on deadlifting (conventional) today, by how much should I deload the weight that I was originally at?
Note that prior to the shoulder strain I got 3 weeks ago, a month before that I had another shoulder strain (yes, please don't judge) and at that time I was deadlifting 345lb for 2 reps. 3 weeks ago, I was at 280.
Sounds to me like there are muscular imbalances around your shoulder joint. Don't do anything besides rehab, and see a physical therapist.
If it truly is a deltoid or rotator cuff strain, then putting a load on the shoulder is going to just possibly re-aggravate it. I would wait until you are pain-free with your activities of daily living prior to returning to putting a distraction force on the musculature surrounding your shoulder. Once you are pain free with daily activity, start out with weight around half of what your were pulling prior to the injury with higher repetitions then gradually build. Good luck.
I believe he mentioned in a different thread, that his posture was bad. He should first fix his posture/imbalances, because the inflammation and pain might go away, if he rests, but that does not mean that the actual problem is gone.
I believe you should consult with a doctor first. Maybe it's better stop deadlifting untill your pain is gone. Take care of yourself. Don't force yourself too much. Good luck.
Thank you for pointing this out, Odin. I did not see his previous thread. I agree.