Additional height helps, but I think the design of the Area 419 cup could be improved. They need to slope the sides out rather than in and also round the bottom of the interior of the cup. You want the initial powder kernels to land on the sloped sides and slide down into the round bottom without ever impacting anything that makes them bounce. Once you have some powder in the cup, those kernels absorb energy as well. That's why the stock shot glass with a handle works when it is placed correctly under the funnel.
FWIW, I'm a fan of area 419 products, but not this cup. Sloping the sides inward works for wine glasses, but not here. Love their powder funnel sets.