I honestly just suggest working backwords through his catalogue until you start to dislike it. Tender Prey is a decent time jump if you feel like doing that, but you are around the point where I don't think you will see a huge jump in style (just slightly rougher songwriting and composition as he gets closer to his Birthday Party origins). I pretty much consider Red Right hand the pinnacle of that era of Nick Cave and Murder Ballads is the bridge between his earlier style and his newer more mellow stuff (not that he ever stops visiting his early dark themes and not that some of the themes in his mellow stuff wasn't ever touched on early in his solo career). So in short, yeah I would go with Let Love In and then just slowly keep working backwards like you have after filling in eclectic gaps.
Skrillex & The Doors - Breakn' a Sweat