Just got my fork in and did a travel change, still not ridden. Afterward, noticed some notchiness when compressed quickly. Pulled the lowers, cycled the air spring and noticed the same feeling. After pulling the air spring it seems to come from the lower part of the assembly. The large black plastic piece that presses against the metal piece which threads in the legs. When I slide that up and down the air shaft, it's pretty noticeable. Lubed with slicoleum and reassembled. First couple cycles felt fine but then the notchiness came back. It does move very easily, basically no stiction, just the notchiness.
Any ideas? Semi-bath oil instead of grease? I thought I'd figured it out and resolved, but apparently not.