if you like them the way they are, then just leave them alone. crocheting is used generally when dreads are really young/maturing, and less and less as they age, at least for people who do it on a regular basis. some people try out crocheting to clean up loose hairs when they're head gets really messy. some people do this a couple times a year. it's a touchy subject because it can cause damage. not making visible holes but breaking hairs and making the broken ends stick out, like tiny strands of barbed wire. other people don't like it because if done too much, the dreads look woven. there's a section on it in the FAQ at the top of the page on this forum, and there's a million zillion videos on youtube of how it's done. if you like your dreads just the way they are, then leave them alone.
LOL! they look like those synthetic dread-extensions (probably are!). good movie though i'm pretty happy with my dreads as they are. where i am living at the moment, i don't know anyone with dreads, so i'm using this forum and other sites as my info source. most of my dreads are tight on the inside and quite fuzzy on the outside. i am just supposing that over time the fuzz on the outside will knot up. it's fun! i like the prolonged anticipation for what they will be like in 6 months... 1 year... etc. thanks SJF
to be honest, i could never get rid of my loops or bumps by crocheting... and i wouldn't want to either. i do it mostly to keep them less frizzy for right meow.
I let mine form naturally (no manipulation other than sea water every day for 3 months) since I have super thick, coarse (kinky under a microscope), wavy, greek hair. They took over a year and when fully formed were about 14 inches shorter than my original hair and super super ratty. A friend offerred to clean em up with a crochet hook. I told him okay but not too much. Loved the results and have done it about 3 other times over the 2 1/2 years since the first session. Never had anything break (hair type, obviously)