Going by your tank dimensions, it sounds like you're using a 40-Breeder. It's a common tank size, and usually referenced as such, so that may help you find other people that have asked similar questions on lighting.
It took a bit to find solid info on that Aquamai light. Made by Hydor in Italy, so it's likely a well made light, but the outputs just aren't there. They advertise a max par of 185 in 24" of air. If this is the max expected PAR, it's simply lacking the PAR for SPS corals. Numbers will drop a fair amount in water as opposed to air. You'd be fine with lower light corals, the spectrum is right, but it's not a powerhouse by any means. I can see why you feel an upgrade is needed for a mixed reef.
Personally, I'd say a single A360X wouldn't get the coverage. Optimally you'd need two of those lights, or something with similar/equivalent output. The AP9X will get similar performance to two A360X's, but save you $50 and have one less power cord to worry about. Though you will lose the ability to adjust spacing between the lighting elements, and separate A360X's will let you tune each half of the tank differently based on how you place your corals.
You could theoretically shift your SPS and other high-light corals to one side and use the A360X, then the Aquamai on the other side covering your lower light corals. Not optimal but I know how things sometimes have to be done on a budget.
More critical, if you do get a light in the same range as the A360X, you need to make sure to acclimate properly. It's a HUGE bump in output from your current light.
