Failure Optimal for Hypertrophy

Curious how others have been doing with this. I am enjoying the heck out of it. Toying to find the right exercises to used for the failure parts. I just don’t know if it matters. I switched to a double stim approach because it fits my schedule better.
I am using on the heavy days a 8ish on the perceived level of intensity.
My finding has been, contrary to what I would have thought, that on the days I am using a lighter load to failure, I am wickedly hungry after, and it is very tiring. Feels good though.