I have the most success when I'm more patient and wait for my blockers to set up and then hit the sprint button once I find the seam. It is still pretty rare that I return a kick for a td though, in my online franchise we are in our 3rd season and I usually average around 2 returns for a td a season. I feel like it's a little easier against other users though because they'll sometimes user a coverage guy out of position by taking to aggressive of a pursuit angle. Then it just becomes making that guy miss and taking advantage of the gap they left. Against the CPU I probably don't even average 1 a season because they always stay on their lanes so it's harder to find your opening.