@Chase. I don't want to distract from my original questions, nor do I feel that I need to justify that I like carrying fleece. But since you asked...
I almost always carry either a microfleece pullover (TNF 1/4 zip, ~7.5oz) or hoody (Patagonia Micro D, ~9.5oz), and they are probably my favorite pieces of gear. Cheap, comfortable, versatile, non-finnicky, light-ish, and warm enough 90% of the time when backpacking in the summer. I can wear it by itself to get out of grimy hiking clothes when sleeping, which helps keep both me and my bag clean. Bulk is not an issue since I can strap it to the outside of my pack if I need to. The power stretch tights/pants I made myself (~6oz) and are an "as needed" item that I would bring for slightly colder conditions (e.g. Sierras). Anyways, if you really want to hate on my gear choices, we can talk about how the new version of the GoLite Jam is superior to both the ULA Ohm and the GG Gorilla, all of which I have owned/used. ;)
@James. That is definitely helpful perspective given that you own both bags. I'd probably like to avoid modifying a new bag, since that's one of the appeals of buying it rather than making my own quilt. Both sound great the way you describe them (too warm at 31 degrees can't be a bad thing).