OME 887 and 90021 Lift Height

I put 887 coils on my OME 90021 shocks this past summer and initially only got about 2.5" of lift and now it's down to about only 2". From what I've heard 887s should give about 3" of lift. Anyone know why this could be? I measured the hub to fender recently and it measured a little over 2" over the original height. I originally had the same 90021 shocks but with 884 coils and had about 1.75" of lift. I have bottomed out pretty damn hard back when I had the 884s. Could it be related? The shocks aren't blown or anything and they ride fine. I'm considering just buying the 90000s with 886s for a bumper up front and winch. Any help or tips are appreciated, thanks.