OK -- so you have a choice. TFP prefers to not recommend the use of pool products as they can be mis-used. Clarifiers is one of them. In your case, it might be applicable. It is imperative to be algae free when using it. Your 4 OCLT passes in a row provides that assurance.
If you decide to use one, get a quality one. SeaKlear Chitosan clarifier is one. Orenda makes one too. Do be prepared to deep clean your sand filter after using that product.
Update. I can finally see the bottom! Still haven’t added a clarifier and I don’t think I will. If I’ve been at it this long there’s no point in trying to rush it especially since I’m not even getting in the pool and it’s just gonna get closed anyways. I’m in Illinois and it’s getting colder