Wot, no snow? (seven pictures)

I like Tension as well, Andrew. Though it is spoiled by the blown highlights. To answer your question, yes, using Raw may well have made the difference here. Am surprised you don't use it already - you've clearly got PP ability, and converting from Raw is one of the simpler tasks in PP-ing

I like Walking the dog, too - though the top left corner bothers me (more compositionally than because it's blown).

Tension and Walking the Dog for me. Tunnel needs a little child's face in the picture IMO

Blown highlights remain blown whatever you shoot in but if they have not totally gone and are borderline you stand a better chance of recovering detail by using RAW.
I tend to under expose by 1/3rd of a stop, sometimes 2/3rds or more depending on conditions. It's easier to lift dark areas than it is to recover the highlights, and this is best done in RAW.
There's nothing wrong with your black and white pictures Andrew but I find I get better results converting to mono in RAW.
David