Regardless of time settings all games started by me are taken as blitz, this does not happen when I take someone else challenge. Kind of funny that my blitz ratting reflects that I am a coward that does not take as many games with SDK voluntarily.
Looking at your profile it looks pretty balanced to me? Are you just choosing blitz time settings for your open challenges?
No, i do 6 minuts with three 15sec periods, but they still modify my blitz ratting. For example https://online-go.com/game/3588508, which at this time is my last game started by me.