Is any of the different relative modes higher than 7-bit resolution?

[mlib]

You’re pretty much correct in your assumption. There is no benefit in resolution from using relative encoders in Cubase’s MIDI Remote. Cubase does not expose any multiplier for scaling when using any of the relative modes.
See this topic:

MIDI Remote, Relative value mode

Thank you Steinberg for including different relative value modes. As I see it, the downside with using Absolute MIDI CC values is the limited resolution of 7 bits (0-127). Using an encoder that sends Relative MIDI CC values can potentially overcome this limitation. Unfortunately, Cubase 12 currently does not take advantage of this as the scaling of the controller value to its destination is fixed and cannot be altered. Example 1 (Absolute CC value): The controller sends CC values between 0 …