I like the aquarium bubbler idea. Anything to provide some vibration may prove to settle the powder to on constant state throughout the entire reloading session. Im surprised someone hasn't marketed this already.I've been running a Dillon 1050 Super for 19 years and load 9mm, 38Sp, 40S&W and 45ACP, all dies, powder measures and bullet feeder drop tubes on their own toolhead.
All loads are made to a power factor that I like.
For powder drop consistency I mount a aquarium bubbler to the hopper.
All of my rifle loads are done on an RCBS RockChuker from the 1970"s with weighed powder charges, one at a time.