I don't bathe the film in photo-flo instead I hang it up and pour the photo-flo down the length of film
Seems to reduce those bubbles a lot
4x5 I always end up getting some bubbles no matter how hard I try to keep bubbles out of the rinse so I may try the finger wipe method one day here
I don't notice any bubbles once dry or on the contact prints, though ..maybe if enlarged?