As suggested above it was in fact air at the top of one or both of the cylinders.

I called the installer this morning and he said that it was probably some air that had worked its way to the top of one of the cylinders. He said to bleed cylinders.

To bleed he said to raise lift slightly. Then loosen bolt on top of cylinder farthest from the motor until fluid with no air came out, then do same to the other side.

I bled as stated and it now lowers smoothly. Installer said that I should not have to bleed again since there should be no more air in any of the lines.