hows your fingerboard relief, it may measure that at the end but it may not give a bigger picture of the action elsewhere, I recenty bought a used westbury and the action is similar to yours at the end of fingerboard but its about 1-2mm higher in the middle and at the nut end it gets high quickly so I will be getting an easier relief applied to the board, its also got spiro mittels on which are higher tension than I prefer so im going to be putting some weichs on, no one can tell if your action is to low as there are many factors involved, go see a luthier and he will be able to advise from your playing technique what relief/string height you need and maybe even an adjustment or not in your right hand technique, im not an expert , im sure someone else with more experience will be able to comment on what I have said, all the best mate, Jez