Strawberry Cake Roll

How many attempts have I done so far for a perfect Swiss cake ? Im not going to count cas Who cares..?! Lol.
Recipe:
4eggs in room temp.
80g sugar
80g cake flour or all-purpose flour
20g custard powder
1/4tsp salt
50g oil or melted butter
1/2tsp vanilla

1) line a sheet of parchment paper in a 11x23"baking tray... beat together eggs and sugar on hight spoken for over 7mins, or until you reach a consistence of thick ribbon. The beaten egg-sugar mixture should be pale in color and doubled in size.
2) sift in flour, custard powder and salt. Fold it in gently until it is combined, do not mix too hard which will destroy the air bubbles and results in a dense cake.
3) add oil and vanilla, fold it in as well.
4) pour batter into the prepared baking tray . Bake in 375F oven for 15-17mins or until the top has turned golden.