As long as they haven't been cut already you probably shouldn't have a problem. First suggestion is to sneak up on it. Cut half a coil first, see what you get. Then proceed if necessary. Also, don't cut the second one as much until you're sure they settle the same. Sometimes the second coil needs to be cut either less or more. Much more than one coil and you run the risk of taking out too much compliance and ending up with a stiff ride that'll jar your teeth.

If that doesn't do it then it's dropped spindle time.

Double check the travel on the shocks, you want to be in the middle of travel length at static heighth. If that's wrong before you start on the coil cuts, then fix that first.