zone system/film processing

I just developed my first 120roll of Delta 400 in Xtol. The negatives look very nice to me but I was wondering how I determine if the 10.5 minutes I gave the file shouldn't be increased to 11 minutes or decreased to 10 minutes. In the Zone VI book I have it suggests exposing a roll to zone on at asa, 75% asa, 50%asa and 25%asa and then checking with a densitometer. Is there agreement that this is a good approach to finding the best time/asa for a given film or does someone out there have another suggestion? I would have thought that I should also expose for zone V and X to test those out as well. P.S. thanks to the folks who helped me out a month or so ago with the problem I was having with my Xtol. It DID turn out to be a bad batch from Kodak and they replaced it. Regards, Anthony

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