I dont know if he still does, but Arentz used to have a table of drop counts using sodium platinate as the restrainer as opposed to potassium chromate in his web site.
I dont like the Na2 method much, some swear by it.
Here you go "Restrainer - chemical constituent of developing solutions which helps prevent reducing agents from affecting unexposed halides and converting them to black metallic silver". Found it here
Na2 is a restrainer used in palladium printing to increase the contrast of the print. It acts by inhibiting the sensitivity of the solution. It affects highlight areas more severely than shadows and thus increases the resulting print contrast. Varying the amount of Na2 solution you add to your basic palladium-ferrric oxalate mix will allow you to fine tune the contrast. The downside to this method is that it uses a platinum compound that can significantly cool the tone of a palladium print. It is also useful only for pure palladium prints. The benefit of this method is that it does not cause graininess in the print like some other restrainers can when used in the larger quantities.