On a 1010 head, in real "bushy" wheat, it would do something similar. There would be a swirl effect for the wheat about 3 feet wide, right in front of the feeder house. Those fingers just weren't long enough to pull it in.
With a 1010, if you drive above the speed where that starts to happen, you'll end up not cutting all the straw in that patch right in front of the feeder house. Unfortunately, we never found a good solution to this other than just driving slower. It wasn't common, but when you're cutting wheat like this, a 36' draper will still make a clean cut at speeds faster than what that 30' 1010 would. The drapers don't have this bunching issue, as there is no auger to hold the pile back.
The sickle on a 1020 is a few inches farther forward than a 1010, so I'm not sure if you'll ever see the pile build up far enough to not cut the wheat right there.
Check the flighting on your auger, if it looks worn and rounded and smooth, take a grinder and square it back up. Done this before and it works great, big difference on feeding. It was in soybeans but I would think it would help in wheat also.
Add a half a link to the feeder house chain, it will move the feeder roll out a little bit and which helps quite a bit, also try playing with the reel adjustment such as height and slide. It won't completely eliminate the issue but it will help.
You might want to check the lower stops on the auger on the LH and RH side of the head. Dirt will build up and cause the flighting to move away from the floor. Then check the finger timing in the center of the auger they should be fully extended at about the 10:00 position when looking from the wobble box side of the header. This will pull the wheat under the auger and into the combine. Flight extensions will help in this situation too.