I've gone through a lot of phases with my space-barring
long long ago it would be with only my right index finger. Then I decided I wanted to be over 110 wpm, and I decided to switch to thumb. I did both thumbs (super weird, I know), and it was more towards the edge (m area and c area). Now I only do left thumb, and it's more towards the center (in between v and b). This probably happened after I got my Planck, but only recently noticed it.
It's gonna be interesting when I make my split spacebar Golbat, since I'll have Ctrl as the right space key, and space for the left.