I second the idea of upgrading to the 32" socks. I use them and although they sit a bit horizontal in the sump, they double the time it takes for the 16" socks to clog. I just blast mine with a garden hose on the jet setting...it's amazing how much crap a 32" sock will hold.
My apologies if my comment prompted you to go with more nozzles than you would have otherwise used. You are correct that I'm only using one pump on my setup...it's the Laguna Max-Flo 4200 (it's an older version from 2011). I think I have about 9' of head in my system, so I'm getting around 2,000GPH, which is pretty low turnover by most everyone's standards. That's why I didn't want to restrict flow any further using loc-line on my setup. I also used 2" plumbing (I know that's overkill, but I originally had a Reeflo Hammerhead pushing around 5,000GPH).
Are you using check valves? I opted to not use them since they can restrict flow and my sump has plenty of capacity when my pumps are off. I don't like the idea of relying on the check valve to work to prevent a flood...I just don't trust them. A concern with locline would be if a big fish knocks the nozzle(s) down into the water column and you have a power outage it could overwhelm your sump. Since you have multiple nozzles, that shouldn't be an issue. Anyways, just throwing out different thoughts....sorry for the rambling.
Your whole setup looks pro...nice work!