Thanks
@Finicky, this was really helpful. I adjusted the video settings to 1080 and 'Low Quality' and was able to run it sustained for over 30 minutes on the bench, until I turned it off. The module got close to shutdown temp, but stopped a few degrees short when I elevated it off the surface a quarter inch. (Note to your question: the BEC is putting out 5.00 v under load)
I'm left with a couple new questions, not sure if you or someone else will know the answers, but:
1) Is there a way to run the camera without the aluminum shield? I'd like to put a heatsink directly on the chip - not sure if I can 'short' the system somehow to get it to run without the shield screwed down. (The lowtech method would be to remove the section of shield directly over the chip).
2) How does choosing a Low/Med/High setting for 'Video Quality' impact the video - this is separate from resolution setting. And I don't see a compression setting to modify, per your suggestion - maybe it's not available on Split HD, or maybe the Video Quality setting is actually for compression? (Thought I'd be able to find this in RunCam documentation somewhere, but coming up short on their site and via using my google machine).
Appreciate the insights - already seems like it might be a usable option now.