Hi,
I'm not having any problems with Garritan. CC levels are doing exactly as told, here. Really happy using key-switches for articulations.
Hopefully, we'll find more information - I'll keep an eye out for strange behavior.
A trip up can be if you try automation lanes on the same CC's as in the midi track. I find you either need to stick to no automation/CC's in midi track only, or automation, but not both. It is possible to import midi track CC's into the automation lane, but for some reason you need to correct the curves to use 'jump' between CC's.