Doing some reading about the Hoyt Boom, the intent of the designer, Steven Schock, was to expand on the easy-handling, large-cockpit daysailer concept of the Harbor 20 and provide increased interior volume for overnight stays aboard. V-berth, two quarter berths, small galley area, and a head—enough for two or four people overnight, not for extended living aboard.
The Hoyt boom idea is to simplify handling through self-tacking, with all lines running to the cockpit.
I would begin inspecting all of the sheaves and fairleads for potential failure. The goal is to reduce friction. Perhaps lubricating/cleaning the sheave bearings or pins. Replace any broken or groove-worn parts. Sail-Kote is a good lubricating spray.
A 3/16ths line would be difficult to handle. Examine the width of the sheaves to see if they can function with a larger diameter line.
Good Luck. Let us know what you find.