Muddydogs,
There is a long sticky over at AR15 dealing with tweaks for a Dillon, including their powder measure. It's a real good thread and very useful for Dillon owners. One thing it advises is to polish the interior metal of the Dillon powder measures. Another thing is using a small electric motor to provide vibration to keep powders than tend to jam flowing.
These modifications work with any brand of powder measure, so you'll likely to find your fix for your measure in them, unless you want to spend money for additional measures, which may or may not correct the problem.
Add to that the various manufacturers, such as RCBS, have been selling powder baffles for years and you'll find the resolution to any problem you are having. Uniflow owners have added baffles and polished interiors in the past to solve powder flow/sticking issues.
Sticking powders isn't usually a fault of the brand name of the measure, it's part and parcel to problems all measures have handling certain powders.
Various measures handle various powders better or worse. Manufacturers cut corners to keep within a certain price range. Add the two up and you'll find you may have to do some tweaking and tuning for any brand measure you buy.
There is a high end measure, the name of which escapes me, that is basically a modified Bell and Mulden measure. It handles extruded very well, is made of brass and steel and comes polished. But it costs about as much as a Hornady LnL or Dillon 550 if you order it complete ready for case activated powder drop on a progressive press. But doesn't offer powder through expansion last I knew. Might now though, for a price.