There may be some difficulty with the language used in the settlement documents.
A C&R is "new money", even though it may be based on the PPD indemnity due, and future medical care considerations. There is no money in a C&R for ''wages''...as such.
In Calif, you cannot receive PPD and SDI or UI for the same periods of disability, that's in the labor code...your STD/LTD apparently is applying the same rule.
There is no court of appeal on a LTD policy...you are at the mercy of the IC writing the coverage.