Sorry for the late reply it was held by KZfaq for some reason :( Unfortunately if you add too much yogurt more than the actual amount the excess moisture in the cake will not help it rise properly. You need some kind of fact in a cake to help bind the ingredients together. You can use healthy oils like Coconut Oil for example or lighter oils like Canola or Rapeseed. Hope my answer was helpful and sorry again for the late reply :)

@@Kitchenity Canola oil is rapeseed oil