I learned a lot from Kerik K. And I think he would be the first to tell you: Paper, paper, paper. Both of the ones you mention do suffer quite a bit from dry-down let-down. I doubt if it is your clearing steps that are the problem. Try a paper like Platine or COT320, or add a drop or two of PVA to your coating mix for the papers you mentioned. I have printed some negatives with exactly the same coating mix, developer and clearing on Platine and Lenox and platinotype, and Platine wins every time for "visual pop".