You must format cache after install also! It has happened to me that my phone went into a bootloop after installing new firmware if I didn’t format the cache. Also the first time you boot up after a firmware installation let the phone sit for like five minutes on the boot screen. The first boot always takes longer than usual.
BTW, these roms are for the international version only (i8190). If your model is just plain 8190 then it might not work. I think samsung themselves released kitkat update for the american versions.