Managed to turn TV Settings to 4:3 and the emulator Image looks perfect. It is a pitty you can't set it within the emulator.
As for Amiga360 Emulator, I test. Turrican Gamesm SWIV, Ruff N Tumble, Watchtower AGA. All work in my opinion exactly like running it on a raspberry pi 2 with uae4arm.