Just wanted to post an update on this one. We haven't changed the water yet because we haven't had time and with using the bleach, things have been going well so no need to right away. We seem to have it down pretty well where if we're not in it, we add enough bleach to raise it 5ppm / day and that's about what gets used up in 24 hours. If we're in it we raise it another 5 - 5.5ppm / person hour of soaking. This keeps it right about at 9 - 10ppm FC each day which with our CYA level, is about the target. The water is crystal clear and since switching to bleach, we have zero soap scum or bubbles anywhere and our scum bug floater thing isn't oily at all.
Net net, the bleach seems pretty easy to deal with. Once we do drain and refill, we'll have to figure out how many ppm's we'll use each day since it'll be a smaller amount for the targets we need but a little trial and error. Tho one question, for bather load, does the required FC ppm's stay the same regardless of CYA levels?