All season?
thats has always been my thinking. Fleece midlayers are pretty much useless as they are totaly one dimensionalI don't backpack hunt so this may be stupid, but why would you choose a fleece mid layer over something like the Sitka Jetstream? Is the fleece that much lighter than the Jeststream? Seems like more bang out of the softshell than the fleece.
I wouldn't use a softshell, but that's my preference. The last couple of years I have ran a mid-weight technical fleece hoodie to be my go-to rather than a softshell. It doesn't do well in the rain, but neither is a softshell. It does OK, in the wind...probably less effective than a softshell at shucking the wind, however, it does well with ~10 mph winds; if the winds exceed, then I'll throw my rain shell on over it.
I run a merino t shirt (I'm cold blooded), merino light weight LS Tee, and a kuiu peleton 240 hoodie most of the time in CO archery season . I keep a puffy and rain jacket for evening sits, glassing in wind or when it gets cold. I've blown out a couple of elk due to noise of my puffy, so I try to avoid wearing in the morning and evening. Hope this helps.