Nice short piece on Bike Geometry
http://www.calfeedesign.com/tech-pap...bike-handling/
The reasons that the OP finds his current bike twitchier than his Puegot are likely less trail,steeper head tube angle, and longer wheelbase. I'd be willing to be you the Allez has a steeper head tube, longer wheelbase, and less trail.
__________________
You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.