This emulsion has always had a slight fog problem from the start. Everything has been tried to solve it including lower temp, longer or shorter washing, etc. I did get a little better result by adding a very small amount of rapid fixer to the developer, but I ordered ammonium thiosulfate to add to it, the fixer contains acetic acid and that shuld not be used with cyanates. I am still here.
Again this is for tintypes, they are more suseptible to showing fog than negatives, just like wetplate tins.