How exactly did you set the secondary controller? Is it set to match CC1 for all patches on all instruments or is there a qualifying range in some instances (such as 30 - 100 or whatever). In theory this should not be relevant for jitter but one issue I had with a different library was the main volume. Was reset to max after any patch change if you used velocity. If you’re using an existing EM rather than your own, some instruments or patches may set the primary to vel instead of CC. Again, as you seem to be on CC1 and 11, this doesn’t appear on the surface to be relevant and I don’t yet have evidence that there is a problem if you do — most likely for shorter patches.
It may be that you’ll see something in the areas mentioned but unfortunately I’m flying blind a bit here without Dorico access just now and I’ll keep quiet in the meantime unless I have something fairly concrete.