It is not too close for the bigger 65", just a matter of appearance when off.
Resolution: you can readily see in a store if you stand too close to a too big screen, typically not the issue. Too big: It really is the width related to your field of view, seeing both sides without needing to shift your eyes left or right any, Imagine reading sub-titles, while viewing. Paper is 8.5" wide based on natural field of view at reading distance.
I chose a 55" Sony, nearly identical distance, I sit 10'-6" eyeball to screen. Moving up from a 47", I thought a 65 would just appear too big in the space when off.
Since visiting a much bigger screen at a friend's home, his looked too big when off, but was not too big while viewing. Mine certainly could be 65" when on.
Height: We made a temporary adjustable stack of books to find the best height because Donna is 5' tall, I'm 6' tall, and I wear eyeglasses with progressive lenses and it effects your natural gaze, neck muscles ....
I made a 6-1/2" riser, and that allowed me to place the center speaker directly below the Screen, which has always sounded best for me. bottom of 28" high screen is 39", center 53" Center could be a bit higher like my friends was.