hello! I believe khuioduan meets most of your preferences, being a fairly slow-paced game that is very backtag-friendly. It is a panfandom fantasy-style game with a slowly evolving meta-plot and many opportunities to generate your own mini-plots depending on what your affinities are each month; this leaves plenty of room for slice-of-life RP, which is my main jam tbh. RP is equally dispersed between the network and log comm, though plot-relevant things are mostly restricted to the log comm. AC is 15 comments across three threads.