I suppose it is a matter of why one is toning.
Just for archival purposes, one uses a much more dilute toner -- which results in little or no change in density or color. No reason to print differently.
Toning for color change -- usually higher dilution, which can cause an appearent rise in contrast with the shadows darkening slightly (highlight values remain the same). Might want to print with slightly less contrast -- not over-all density (that is, lighter), so that the highlights stay the way one wants them. Printing lighter might lose the delicate highlights one wants.