Couldn't remember the video I saw this in last night, but this is onboard an iqfoil course race. Look how often he's tweaking the adjustable harness lines as well as the outhaul. I personally find tweaking the outhaul about 5x easier than the lines while on foil, but they're doing it a lot in races like this.
Side note: The chinook ones with the handle are ones I kept accidentally hooking. The race style lines (like Rytis is using) with an open clam cleat are so easy to change and don't have a hook, but go extremely long so you have to knot them if you need the longest setting to be limited. The severne more rigid ones I tweak a lot less when freeriding. I also recently have tried starboard ones and I like the adjustability but the rope lining isn't quite right and they tend to hang in the wrong place 75% of the time. Will probably replace them with race lines. The point-7 and lisa ones looked great but haven't tried.