In a Rut

Some ideas: build on Rise rather than Storyline, move to microlearning, use video software such as Lumen5 (simple and effective/quick way to transform boring text), use Kahoot or other quiz software as a teaching modality (who doesn't love a good quiz), use Scenario Based Learning (upskill or educate your SMEs to give you scenarios, or think in scenarios, that cover the required learning). For example, you could do a series of micro-modules in Rise featuring purely or solely SBL. 

And finally, do you need to get comfortable editing what they give you? I definitely edit my SMEs but ask them to review to ensure I haven't changed clinical context. This seems to work because they still feel like they have final say.