Recently (4-5 months) I have been using Xtol stock and 1:1 dilutions for much of my film developing. At first I was pretty happy with it, with higher ISO films I liked the finer grain and I was clearly getting a speed increase over D-76. As I began to use it more I did notice what many others have experienced and that is fairly flat negatives. I changed my agitation from 2-3 inversions every minute to 2 inversions every 30 secs and with little extra development time. That has moved me in the right direction but I am not entirely happy yet.
However the bigger problem I am having lately is uneven development. Yesterday I developed two 120 rolls of TMAX 400, one roll each of Neopan 1600 and TMAX 3200 and in most cases there was evidence of some uneven development. These were also three different development events using stock for Tmax 400 and Neopan 1600 and 1:1 for Tmax 3200. I also changed different Xtol batches. Same results.
In parallel to this I developed two rolls of tri-x 120 with PMK pyro using the same reels and tank and had no problems whatsoever.
So I dunno, I have never had a problem like this with any other developer. Is there something obvious I am missing, anyone with a similar experience with a solution?