NSPYTE, My 2013 STS SE5 is bone stock and when I crack the throttle hard in first gear I too get a split second bog, then it "catches up" and takes off like a screaming banshee.
This only happens in 1st gear! From any other gear if I roll on the throttle hard it takes off in a hurry!! But from any other gear I am usually at or above 5,000 RPM.