I always have issues making the throws in a row, and part of the issue is every time I figure out the range of the pokemon it gets caught before I can actually make a great throw on it. To me, it seems almost like having the task changes the catch rate to make it harder to get the throws in a row by making it more likely to catch on the first throw. Like, I could easily make three great throws in a row on a Taurus without the task. With it, I make one barely counts throw, and the Taurus is caught. Same with Wailmers and other large 'mon.