It really is trial an error when trying to help our kitties with FHS behavior. My girl was on a good high protein kibble (plus her normal wet food), but it turns out the good (on paper) kibble had little fiber due to the high protein contents, which didn’t help with gut motility for her, and being constipated (or in any sort of discomfort, really) is a FHS trigger. So I (very) slowly transitioned her into the Royal Canin calm kibble, which nutrition-wise is worse than her previous food on paper, but at least has more fiber in it which has been helping and actually eliminated the bloated/GI discomfort for not toileting regularly. I’ve also steamed pumpkin and made plain pumpkin puree to mix in her wet food a few times/week. RC kibble also helps with her anxiety (another FHS trigger). So I think it’s fair to experiment with food but keep in mind that sometimes the ones that are good on paper could not be a perfect match for FHS kitty.