You are doing the rightthing removing unwanted food. I would continue with 3 for about 6 months .
I used to give little amounts of goodies too such as an egg or some cheese. or yoghurt is good too.
At 6 months I switched too adult food and lethim lead the pace which was 2 meals a day with treat at dinner time and evening time.
Buster actually changes his feeding habits regurly, at the moment he will only eat one meal day, but I expect this to change again soon. It all depends on if hes had a good run, or if hes bored with the usual kibble.