Trojan did a Yabby You double CD box set a few years back - Jesus Dread (so he's not an orthodox rasta - believes Jesus, not Selassie, is the messiah). It's all mid-70s stuff and this box set has all the dubs and assorted versions as well. Your opening lines reminded me of it - especially the word "mournful" - so much so that I really have to be in the mood to listen to it. But it may be right up your alley at the moment. Its slow, melancholic, heartfelt, very spiritual. More like hymns with heavy bass than a reggae as we know it.