Multiple R650 AP's in apartment building and poor signal strength

[daniel_baker_a6]

I have 5 R650 APs between 2 apartment buildings.  One AP per floor with 4 seperate SSIDs per AP.  The signal strength is horrible.  It's hard to even get full signal when you are directly below each AP.  I'm using a SmartZone controller.  What settings would anyone recommend to obtain the best wireless range per AP?