Quote Originally Posted by srs5694 View Post
Another possibility is that Kodak (if they supplied times to Freestyle) and Ilford disagree on the time required for this combination. Such differences do happen. Do you happen to have Kodak's suggested time for Tir-X in DDX 1+4 available? If it matches Freestyle's time for Premium 400, then that's the answer.
Frankly, I wouldn't pay much attention to non-Kodak developers, unless D-76 based. Even there, ID-11 has different times, I presume due to different agitation suggestions.

AFAIK, all the Kodak developers are a perfect match to Plus-X and Tri-X.