I used to feed Jack and Jill out of the same bowl too. But soon enough, Jack would eat most of the food and poor Jill would get hardly anything. So now I feed them in separate bowls. Jack's a little bigger and he goes on the treadmill every night, so I give him a bit more food than Jill. But I still have to monitor their feeding, because Jack wolfs his food down and tries to get some from Jill's bowl. So I'm constantly guarding her bowl for her

.
I also think you need to stop with the Eukanuba and get a better food. And you definitely need to feed them separately.