Sorry thats a new name to me.
Am just wondering if your boy is really fussy or just playing a game with you, 'like my mum gives me what ever I like
Please don't take my question the wrong way but as my lot are sooo greedy I really would welcome a nice slow eater, the reason being is I am sure eating slower must be much better for the digestion and well being of the dog.
I know if any of mine took more than 30 minutes to clear the bowl I would take it up and they would not get anything else till the next meal.
I also wonder if you have any history about his past life [I vaguely remember you saying he came to you not long ago] it may be possible that he was not fed dry food or possibly had a barf diet, could be a reason for his disinterest.
Also are you happy with his weight, as long as he is not showing signs of skinny ribs then maybe stick with what you have for a while longer possibly soaking with some warm water to make a little gravy might add a bit more flavour.
Hope someone else can help with your original question