The info on growing crystals rock candy style is in this thread Post 476898 (https://www.thevespiary.org/talk/index.php?topic=8002.msg47689800#msg47689800)
(buzybee: "larger crystals", Stimulants)
Methyl ethyl ketone can be subbed for acetone in methods of crystal cultivation which rely on evaporation as it dries at a much slower rate. Personally there is something about it's smell that turns my stomach so I avoid it's use when possible.
Plus I've yet to develop the needed patience for anything longer than a one days duration.