For reasons explained in other posts and not relevant here, I am only doing now Push-Ups and Dumbbell Bent-Over Row (and Air Squats).
For the rows I use a nearly empty dumbbell for the moment. That is far from the ideal push-pull equilibrium. Relative to that, push-ups are a strong exercise: Playing a bit with a scale at home, I reached the conclusion that I was lifting 77% of my body weight at the bottom position of each push-up, and around 65% for an easy version with knees on the floor.
Therefore my question: can that be a problem for my shoulders? Which load should I aim for in the rows? Should I keep the pushups under a minimum? I don't want the next injury to be caused by muscular imbalance...