I have to do a partial back stroke and then continue on.
Don't back stroke. Just force and cut that 4064. Powder will also build up and cake eventually. Take it apart and clean it once in a while.
I won't say that the Uniflo is the best measure out there. It's not. But for the price, it is acceptable. I like the Hornady for how it can quick change to empty it out or put another in place. The Dillon changes out better than the Uniflo, but it's not perfect as a measure for Spherical/tubular powder either.
I'll stand by my recommendation to buy components piece-meal though.
-Steve