In a word - no, you wouldnt reach same comfy ride as in sportscar.

But even without totally changing entire suspension system, just putting in decent shocks will make it feel way better than bare stock. Also obvious things like tire pressure will affect it...

So most likely yeah - if you will get 3" suspension lift from Calmini and do rest of stuff you listed - you will find ride more comfy than in stock X. Not sure though it will be enough comfy for you 8) But then X was built on truck base, and initial purpose was a bit different, so its kind of expected to be more rugged.