Longer travel shocks?

Califab in Sacramento built my truck and I've been very happy with it. I'd give them a call before you order anything on your own.

 

Yeah, sounds like the change in feeling is just being confused with stiffness. The spring rates are unchanged so the suspension isn't any stiffer. The ride, however, may not be as comfortable and compliant now due to your changes in available suspension travel as has been discussed here in this thread. Your options to solve this are to remove the spacer kit and go back to stock height or pony up $$$ for a full suspension upgrade that better addresses both travel and ride quality.