Wow, do you do commissions? He is absolutely gorgeous and you've done an amazing job. His personality shines through 🥰

This is the answer.

Pop a square or two of folded toilet paper onto the back of the toilet bowl where the poop usually hits and it should help it slide off during flush.

Not sure how environmentally friendly those 'poo sprays' are but they seem to have an oil based coating that might help your faeces to not stick as much?