Welcome. I would suggest wearing the traditional-like kilt at the higher level. You will want the bottom of the kilt to be about mid knee level or even at the top of the knee.

I do not wear UK kilts, so I can't comment on those.

The sporran on a trad kilt will be worn about three to four fingers below the bottom of the belt if you were to wear a regular width kilt belt. It can bee a little lower or higher if that is comfortable to you.

Hope that helps a little and enjoy the forum.