Wundebar! There are no nerve cells in the brain to the best of my knowledge

but what you describe is a sure sign of progress!
C major is the most difficult key! White key chords are trickier because all of the white keys are of equal length.... but all of our fingers are NOT of equal length!
Play 4 note C major chords hands together, going up two octaves and back (root, 1st inversion, 2nd inversion root, etc).
Make the overall tempo of the exercise very slow, but make the jumps themselves at LIGHTNING speed, making sure you land on the correct notes WITHOUT playing. Play the chords AFTER you land, FROM the surface of the keys!!
Capiche?