"Workingman's Dead", on the other hand, is IMO one big slice of cheese that even I can barely get through. I'm absolutely dumfounded why it's universally considered one of the best Dead studio works. "American Beauty" is so much better.
i understand why you're not into live Dead. I've grown to like straight-ahead country covers, but they are annoying. And if you don't like Jerry's vocals from "Live/Dead", stay away from anything the band did after 1980 as there's AIDS on it. Hell, I never listen to almost anything post-1980 myself, not in the least because Jerry sounds like he literally can die any minute (though there are other reasons).
I think you should check "Triangle". It's The Beau Brummels' "psychedelic" folk album, which doesn't actually mean there's anything psychedelic on it. If anything it's closer to baroque pop, albeit with folk strumming that was typical for the band. I think you'll enjoy it a lot. I hate any Quicksilver studio records and never listen to them, so I get your description of Dino's vocals very well. However, he was a much less annoying on their live recordings if you can believe that.
And glad to see we're on the same page with Moby Grape. I love all of their first five records. Most people are only familiar with the debut and don't realise that the band had so much more in them after Skip Spence left.
Funny you should mention Sly & Family Stone in the same paragraph as "Laugh, Laugh" because Sly actually produced that song. Yeah, of course Sly should be counted as the SF sound. He was playing practically the same bills and venues as other bands associated with the term.