No, you should not crimp 2 times.
You can Crimp with the seating die, and not use the FCD at all
you can Seat only with the seating die, then crimp with the FCD
You can also crimp with the seating die, and then use the FCD with the crimp all the way up so it does not crimp, as a body sizer to make sure your rounds chamber ok.
For me with a progressive press I have found that using the FCD helps a LOT to get round to pass a chamber gauge.
I highly recommend you get a ECW chamber gauge. they are on the tight side, but I check all my 9mm on it. Using the FCD, 99.9% of my ammo passes the first time around.