Hi Jordana, I work for Eden.
There are two likely things here, one is that you are feeding slightly too much, try cutting back both foods by 10% and see if that helps, the second is a mild intolerance to one of the ingredients, most likely chicken, so it would be worth trying the Catch of the Day which is fish only, or Country Cuisine, that has not chicken or fish. I can't really say for sure on the Natures Menu, which recipes to try, but follow a similar approach, or even cut out the wet completely for a while.
Eden doesn't have pea protein, only pea fibre.
Feel free to join the Eden group or page on facebook, or phone/email the office directly for additional advice.
Hope this helps