Seems you have two issues going here...
1 - The high DPI issues a lot of other folks have been posting about lately (and, indeed, I see you also posted in one of those)
2 - 55" televisions are 16:9, while FF7 was written in the days of 4:3.
It seems you solved #1 already. Solving #2 should just require changing the aspect ratio option from "Preserve to fit" to "Stretch to fill" in your Aali driver settings. You're probably aware that doing so will make everyone look a little... tubby... (not that Wedge wasn't tubby already, but I like my Tifa svelte

)