This seems to be a case of the two films being within an hair of each other in D76, but wildly different in your developer. I've seen that and have mentioned my 13 developer experiment where several coatings gave me different results in 12 of the developers but were identical in the release developer.

This means that your work is not done. If different releases of the same product look alike in a standard developer, but look very different in your developer there may be something wrong with your developer. One way to confirm this is to use another accepted developer such as HC110 to see what happens. If these two films are the same, then the fault lies within the developer and not the coating in the sense of this severe variability.

That does not mean that these coatings are good IMHO. The curves still sag too much in the middle.