Why the hell do my sps keep dying

[niloc16]

no disrespect but '100% perfect water' doesnt tell us much. we need to know

CA
mg
po4
no3
alk
salinity
temp
what type of test kits are you using

those stats would be a good start. then we need to know all your equipment
that you are using. what size tank is it? what type and size of softies do you have? if the tank is too small and your softies are large they may be attacking your sps if they are in close proximity. i would quit dosing until you know exactly where your water parameters are. sps are not impossible to keep, they are just picky sometimes.