It does look like a lot of places will be well through group 5 by 15th February. Which is awesome!
Always will be a slight postcode lottery about it. Not sure the government can help that. Sending soldiers or more vaccine to certain places obviously helps. However age and size of population or geography can slow things greatly.
I actually think the higher uptake than expected has slowed the vaccination program a bit. So if they don't quite finish all 4 groups in a few areas this is probably the reason.