I don't know what effect (if any) the acid stop bath would have on fixer life with an alkaline fixer like TF4. I have used an acid stop in the past, but didn't on this occasion because I ran out during my last session. I have also printed with only a water stop in the past and never had the staining problem though it's usually been 8x10 size. Perhaps the added square inches of the 11x14 paper carried over much more from developer to stop to fix that I gave it credit for. Though I did drain each sheet fairly well.