I feel that the 1935 is an easy find in BU- it's odd they only toned a few.
As for the 'one side only' conundrum- If you were a Mint employee, and had to apply hypo to a bin full of pennies, how would you go about it?
You would have an astonishingly heavy bin of shiny pennies to deal with- maybe it was applied to a pile at a time?
Two pennies could be closely face-to face and end up being a cross between Obi-Wan and Darth- one of them completely on the Dark Side.
Mind you, if two coins were face to face, but one was to one side, there would be the gap between them for the hypo to penetrate
the facing sides, whereas when perfectly lined up, the edges would create a seal.....and three in a stack would leave one with both sides shiny....