I don't use RC but when toning with warm tone papers the effects are usually far more dramatic. Try them if you get a chance. Perhaps also try toning RC Pearl.
Another thing to try is only partially bleaching - pull the paper early and wash and then tone. Some people dilute the bleach to double what the instructions say so they have more control over the amount of bleaching.
And as Ann suggested take careful notes on time in bleach, time in toner, kind of paper, the developer you used, etc .