It may not be any help to you but I tried using replenished x-tol (with primarily FP4) and after I had done some initial testing for my personal exposure/dev times I found it to be a good developer. My caveat is that, at that time, a few weeks might go by between putting films through the dev & without a regular (each week) replenishment (even if no film is dev'd) the dev would slowly loose it's 'bite'. My conclusion with it was a great dev for high throughput but perhaps with erratic throughput, one shot devs give more consistent results, for me at least - other users may have different experiences!!