> and mumbling to himself constantly
I loved this description!! What a babe :)
He's probably still on different timings than you and it'll take a while for him to get into your routines. If he wants to be busy with his food he might like to find it for himself- have a look at the
molecuball - perhaps he could have a small afternoon snack in a treat ball such as this.
I'd be tempted to keep the quantities the same but he may prefer his larger meal in the morning and it might keep him sustained for longer. After a couple of weeks you'll have a better idea of his weight - gaining or maintaining - and you can adjust if you need to.
If he was in a busy rehoming centre there may have been other prompts - such as staff changes, cleaning, open hours etc - that triggered his theatrics so it might not be food hunger but attention seeking. A clever little bean that may just need a lunchtime outing to distract him!! He sounds delightful - well done you :)