Well, it's not like you are using a bargain or compact colorhead with limited controls.
One thing I do now that I didn't do before is develop for a full 3 minutes in Dektol 1+2.
-I used to develop 1 1/2 minutes...
Also make sure you give enough exposure to result in several choices of black.
-The scale gives you 21 steps, so any overexposure will simply give you more information.