@lcorkum I see you are a recent addition to our group of sailors. Welcome.
I have always used water and soap to address the issue of Delrin Bearing maintenance. This has served me well.
But perhaps a more scientific approach is warranted/desired.
Here is what is reported by Dupont...
http://www2.dupont.com/Plastics/en_US/assets/downloads/design/DELDGe.pdf
Self-lubricated : Maintenance and service costs can be reduced. The inherent lubricity of DELRIN® acetal resins can eliminate the lubrication required with metals or other plastic materials, and the need for lubrication during use. Increased part life results because of the good wear life of DELRIN® . Reduced driving power requirements result from low friction characteristics. Contamination by lubricants can be eliminated. Self-lubricating bearings of DELRIN® can be especially useful where cross-contamination of products must be eliminated (food, conveyors, pharmaceutical, and textile equipment).
My guess is you could have a contaminant dirt or grit or seashells in among your bearings. Water and soap may help to dislodge the offending intruders.