Your last QR was incorrect. I guessed and setup a slider on V0 with settings -100 to 100 (EDIT - then I saw your notes on it 
). Made some pin and rotational step changes for my Nema 17 servo, and finally got it to work in CCW direction -1 & -2 (jerky) only. As for the rest, probably just needs some pin tweaking to match my servo/controller.
Well, you have proven dual core works well, and nicely shown how 
And despite claims, I have repeatedly shown that one doesn’t need delay(), Blynk functions don’t block (bad code inside does) and BlynkTimer is reliable and effective… so Blynk users have plenty of choices. Carry on 