It helps to run the drill at full speed/high speed before slowly adding the grains to the hopper.
In other words, it will be a lot easier on you and your drill if you don't load all of the grains into the hopper and try to start the rollers. That requires a LOT of torque.
Instead, just have an assistant hold your drill and BC and get the rollers running fast before you slowly pour the grains into the hopper. I try to have no more than a half inch of grains in the hopper (just enough to cover the rollers). If you're getting a lot of jams (roller stops), either the drill speed is too low (or not enough torque) or the mill gap is too narrow.
The narrow mill gap was probably my situation on the last two batches (I got great efficiencies, but horribly long lauters). I've since widened the gap a little more (grist was too finely crushed, IMO, on the last two batches).