OK, that must be one of the differences between the HB3 and HB3+. HB3+ gives me the option to shoot GoPro color or flat while in Protune. I would guess the 3 shoots flat by default?
Something else you confirmed for me today. Most of my quad videos are running about 2:30, and your 1:30 to 2 minute average is much better. YouTube stats bare this out as well, as my average viewing duration is about 1:30.
Before jumping on the P3 bandwagon, I want to explore what Solo can do. Imagine flying a Blackmagic Micro on that. Now we're getting serious.