I've been using the AquaRite for 12 years. My experience is the opposite. It has been a very reliable unit. As far as the salt range, it seems to work well beyond the specified range (from about 2300, up well over 4000). If you can't keep your salt within that range, you must be doing something wrong. I add salt once when I first fill the pool, and bring it up toward the top of the range. A year or so later, I might have to add a bag due to backwashing and splash out, other than that, salt level is never a problem.
I don't understand why you want a unit that runs with higher salt levels, and how you end up with too much salt in the pool.