I'd agree. One thing that may help you wrap your head around that is to study other folks' spreadsheets - many cats do exactly the same thing here...just take a look at the condos where people say the AMPS is quite high - and then look at the SS for what may have happened previously to cause that...
It will soon become apparent as you follow the trends in those condos and Spreadsheets. There's really a ton of other information on here if you take the time to visit other condos...
Have a good evening!