This one smells very eggy. Sunk 1cm in center. Folded a portion of batter into butter before incorporating. Has assistant to sprinkle in flour and butter mixture.
15 cm mold
Cake flour 80
Eggs 170 (down from 180)
Sugar 90 (down from 100)
Butter 30 (up from 29)
Baked at 175C for 18 mins, then 0C for 4 mins. Removed from pan immediately.