At the risk of repeating myself, I'll ask again. What kind of turbidity is it? Is it chill haze? Does it become clearer when brought up to room temperature?
Or is is it permanent haze? Does it remain the same clarity when warm as when cold?
These are the two major groups of turbidity, permanent and temporary. Unless you determine which group your beer lands in, you are not trouble shooting a problem, you are instead taking a shotgun approach and guessing at the problem. Divide and concur, know what your dealing with and take it from there.
Chill haze is a fairly common problem (if you want to call it a problem) and is temporary. It requires both protein and polyphenols to achieve the "haziness". As the beer chills the proteins form a weak hydrogen bond with the polyphenols, they become large enough to defuse light and become visible. This bond is broken when the beer is warmed and the molecules break apart. Do this cycle enough and it goes into the realm of permanent haze. To get rid of this you need to reduce the amount of soluble proteins and the polyphenols in the beer. Polyphenols are not desirable in beer at all anyway. Proteins are not always bad, but can be a PITA. PVPP (Polyclar) targets polyphenols and leaves the proteins alone. It can be used in the boil or in post fermentation, it does not work well in the presence of yeast. Gelatin is indiscriminate, it targets yeast, proteins and polyphenols. That could also be said for salicylic acid (Biofine Clear). Yeast haze is also temporary. There are remedies for all types, but you need to know what's wrong before you can determine a fix for it.
Permanent haze is usually caused by unconverted starch, bacteria infection, etc. Any of these conditions are bad for beer. Here is a pretty good article about turbidity: https://www.morebeer.com/articles/clarifying_homebrew
If you are serious about getting to the bottom of your haze issue you need to take a systematic approach to find out what exactly is going on with your beer. Guessing and "shotgunning" is only going to lead to wasted time and frustration. I doubt it will be there will one single thing that will fix it.