I agree you should probably stick with a prewritten program at this point. But I'll play.
You'll probably get more out of 2 sets of 5 than 5 sets of 2. Given your 20 rep squat max is less than bodyweight, and that you don't have a 2xBW deadlift, I would stick with 4-6 reps per set.
However, why did you pick 5x2?
I'm not sure you'll get much out of this. You'd probably be better off doing sets of 12-20 of face pulls or other upper back work.
Why go to failure?
Why did you choose those reps and sets?
What about triceps and anterior delt fatigue from the previous lift?
Why lunges? Where are the squats?
Why do you need activation exercises? Are you addressing an actual problem, or just something you think is a problem?
Is this adequate for what? What are you trying to accomplish with it?