My guess is that the newer models which will reflect the NW motion will answer that question.

There is a weakness in the ridging now over the South Gulf coast as the movement of one part to the SW is occurring and the part over the SE is lifting out to the east. That can explain why the storm started moving as she has. But remember there is an expected reinforcement of the ridge along the Gulf coast followed by the sharp trough a couple of days later that is supposed to sweep all this out to the NE.
The reinforcing ridge is expected to keep the storm's northward progress slower .
The models will be sampling all this and the run after this one will be more definitive in my opinion.