i've been working on my gourmand for a while now and wanted to check if there was anything that i could do to feed him more.

Just let time pass and do not put him in the resort. As more food is given to a pet and the site catches on its a food pet the hunger reduces faster.

alright sounds good, wanted to make sure there wasn't anything i was missing. thank you!

If there is a difference in how fast pets get hungry, it's not very easily noticeable (unless this was changed in the past month or so). If you battle with a different pet using it can randomly make a different one of your pets hungry (at least I believe that's how it works). But that's the only way other than just waiting it out, unfortunately.