Upstairs D/E/F would fit your bill - you will each be looking at the next door person face-to-face through the divider - and D will be able to see across to F quite easily. I don't quite get your row forward bit but D/E/F in the same row are face to face. I would aim for the forward cabin on upper deck. If you get the rear row, the centre seat occupant will be able to get out without climbing over anyone. However, the forward facers will have the E occupant in the row ahead climbing over their legs.