What's your build date?
11-12-10 - 6F50/6F55 TRANSMISSION - SLUGGISH ACCELERATION FROM 0-8 KMH (0-5 MPH) FOLLOWED BY A HARSH BUMP OR A SLIP ON TAKE-OFF FOLLOWED BY A BUMP - BUILT ON OR BEFORE 4/15/2011
10-09-09 - 6F50/6F55 TRANSMISSION - DTC P0751 - HARSH OR NO FORWARD ENGAGEMENTS - PERCEIVED SLIP ON ACCELERATION - SLIP/DELAYED AND/OR HARSH DOWNSHIFTS
10-06-04 - 6F55 TRANSMISSION WITH ECO BOOST (GTDI)- BUMP 3-1 COASTING DOWNSHIFT BELOW 10 MPH (16 KM/H) BUILT ON OR BEFORE 3/1/2010
10-04-03 - 6F50/6F55 TRANSMISSION - SHIFT FLARE INITIAL 2-3 SHIFT / SLIGHT DELAY/BUMP 3-1 COASTING DOWNSHIFT BELOW 10 MPH (16 KM/H) BUILT ON OR BEFORE 11/17/2009
If it's easy to duplicate, the dealer should be able to get it fixed. How much longer do you have to wait before the warranty will kick in? Hopefully they don't get you issues!