Fried prawns

I love bubble prawns, but I always couldnt get the right batter. This recipe tastes good. But problem is I still cannot make the bubble kind. the coating is not "fat" enough.

ingredients
prawns - seasoned with soy sauce, pepper, salt, sesame oil.
batter:
11 tbsp self raising flour
4 tbsp rice flour
1/2 tsp salt
2 tbsp oil
water
1 egg white ( divided into 2 portion)


Steps:
1. season the prawns for minimum 2 hours and put in fridge.
2. when ready to fry, prepare batter. Mix everything together and add water. Ownself gauge the amount of water needed. The batter should be thick looking.
3. stir in oil. mix well.
4. beat egg white slightly and add into batter. The other half portion egg white is added to the prawns.
5. The oil in the wok is boil over medium high heat.
6. dip prawn into batter and place gently into the oil.
7. fry until golden. Best serve hot.