The 47% number came from SMP before valor upgrades. The 2285 is also a bit off. To be crit capped against PC with an upgraded SMP, you need 2313 crit rating. You can opt to get 2% more crit on top of that if you want to be crit capped on raid bosses to make setups smoother, but that's up to you. I personally don't use crit food since a death can mess you up for later combustions.