If he's at day 54 with mostly cloudy trichs he's VERY close to done.....at this point cm I'd get my Florakleen out and start flushing. I can link you to zandor's post about flushing.....you'll want to follow it if you're not sure how to do it.

At this point....what's done is done.....Seeds need several weeks to properly develop so any NEW nanners won't make any difference in the short time until harvest. I doubt I would bother misting or anything like that so far along and i think it would encourage mold etc....

You may very well find some seeds in your grow after harvest....they will be female but may be crosses of different strains so I'm not sure how that would affect whether or no you would want to grow them but I would certainly save them even if you don't and then you could hand them out to deserving friends and neighbors.