Well you know what they say about a picture painting a thousand words …
The results from @KevinHolmes tall_thin_calibration_30mm_cross test.
Printed in FormLabs v1 clear resin @ 0.5mm Layer Height.
As @KevinHolmes predicted from my laser spot test the worst surfaces affected were those facing the rear of the printer.
Although I haven’t cleaned the parts the right hand part ( 1st pic) shows the exact same defects as the previous parts I showed. I very much doubt the defects are caused by trapped air.