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It was my Hero Me base. I loosened the screws, twisted anti-clockwise, re-tightened and all is good.
There's now only 1mm difference between each side.
I have noticed that when sliding the duct down the tab fouls the nut to the left of the hot end which pushes the duct frame away from the base. That would explain the 1mm difference.
Do you have that issue also? I'll maybe try shaving off a small amount where it fouls the nut.
EDIT: Shaved a little off the bottom of the tab/arm and everything fits perfectly plus the nozzle is now dead centre :)