Stop using Dektol and switch to Ethol LPD developer. It's available in liquid or powder form(powder is more economical). You can adjust the tone of the print from cool to warm with the dilution of the developer. Stock to 1+1 will give a deep black, while more dilute will give warmer tone, without having to adjust developing times.
My favorite paper developer. I like the flexability.
Moma don't take my Kodachrome away!
Oops, Kodak, of all people, did!