Commonly available commercial developers include sequestering agents and other components designed to prevent problems with variation in water quality.
I'm confident that the functional, working components in the latest version of X-Tol will give the same performance as older versions.
But it may be the case that the newest version has slightly different versions of the sequestering agents et al.
You would be wise to report your concerns to Kodak Professional - they will be benefitted by the feedback.
email:
info@sinopromise.com