Just a real quick thought; had a similar situation once helping a pal. If you have the means, most important being something above the ceiling drywall to nail to, you might consider a "faux beam" to hide the ...joint, or gap. Although there are several ways, a cost and weight- considerate method is to simply run a 2x (your choice of width), down the length of your ridge, (make sure its straight), then "box" it in using 1x6 or whatever. Ideally, the base at the ceiling would 'match' your span. ex; 15' long room would look right w/ a 5" w x8 or 9" high "beam", while a 25' room would want a more substantial "hollow box". You seem bright enough so I'll leave you to imagine how that addition could accent ... Plywood is another alternative to box it in, giving you the options of maple, oak, walnut, etc, which of course is pricey, while cheaper ply could be painted ceiling color or any accent/trim color you may have going on. I hope whatever you do, you do safely!