Warning: Total Road Newbie Here.

I have spent the last several years riding only mountain. I started with a Trek and moved on to my SWorks about 5 years ago. I am SO used to the way this bike positions me and DH, who is a bike mechanic, has completely customized to fit me. I got very used to the position this bike put me in.

A couple months ago I decided I wanted to do some road riding so I purchased a frame and had my DH build me the bike. He built it using a Bianchi cycle cross frame because my goal was to work with this bike for this season, get some miles on it, put the bigger tires on it and use it for Cycle Cross next year and build a road bike.

The problem that I have is that I feel totally out of control on this bike. I mean for a MTB, the SWorks is a very twitchy, quick handling bike (compared to others I've ridden), but good grief, this new one makes that feel like a tank. I'm wondering if maybe to start out, he just built it too light and too fast and if I actually - he'd kill me for even thinking this - add some weight to it, I'd get a better feel for it. Right now it sits just over 16 pounds with my road wheels, computer and water bottle on it.

Or do I just need to suck it up and keep riding it?