I have this same "issue", though I'm pretty sure it's just the way the engine operates. It's almost like the flywheel is ungodly heavy and continues the momentum after you let off. I've been cruising in 2nd and depressed the clutch to rev at someone before, let off the gas for a sec, then let off the clutch and the RPMs were still high enough to lurch me forward and break the tires loose. The engine is just super slow to rev down.
2013 GT - 4.10 gears, JLT CAI, offroad x-pipe, custom catback exhaust with spintech 9000 mufflers, bama tune, Ford Racing short shifter and bracket, Ford Racing K springs, TSW Rockinghams with 265/35/20F - 305/30/20R