Another hack I happened upon came up on YouTube a few minutes after top wrap concerns keeping unwound strings in tune on a Gibson 3 x 3 style neck. To solve the numerous tuning issues (and all other non-straight pull string configurations guitars have), wind the string from middle to top (not middle to bottom) when tightening and tuning. This will cure all those ongoing issues you probably have with unwound Gs, notoriously the most awkward bastards of the string community. Does it work? Sounding OK so far, and excuse the illustrated untidy string winds.
Final tip (and one I've known for ages) a small shot of lead pencil graphite on the nut and bridge rollers (or pieces) can help lubricate and steady the strings and also preserve tuning and create a little less wear and tear (ping!).