Bob... I know you use Kodak Sepia II kits for split tonig. I'd use the part A bleach from one of those packs. I find the stock pot ferri bleach solution to be VERY strong acting. For split toning my prints I dilute it 1:6 or more to get better control over this step and usually for no longer than 30 or 40 seconds. For what you are doing, stock solution might be the ticket to brighten those dull highlights, and crispen them up nicely. I assume you are leaving out the sulphide step and going straight to selenium. That said, the bleach alone at that strenght will tend warm things a little anyway.