Your supposed to mix the salts in with your grist because the salts wont dissolve very well in water, to be honest i never noticed a difference because my mash gets a good mix with a drill.
BUT, you are over treating the beer with salts, i assume your making ~25l of beer so you only need to treat the grist for 25l not 35 but keep the CRS addition for 35l.
Does that make sense, i'm not very good at explaining these things
