hi! khuioduan meets most of your preferences, being a fairly slow-paced game that is very backtag-friendly (I'm currently finishing up a thread from April, this happens often). 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. 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.