Hello, fellow rogues.
As we all know, patch 5.4.8 went live today, and quadruple upgrading pieces will unfortunately change your optimal reforge because of hit and expertise. Unfortunately, the go-to optimizer (shadowcraft) does not support 4/4 upgrades, for the time being at least. Until it does, here is a workaround for you.
1: AMR does support 4/4 upgrades, so you can use AMR to get your optimum gemming/reforging.
As we all know, AMR does not use scaling values for your gear so there are two options to get the correct values. One is to use shadowcraft and get "close enough" scaling values with all your gear at 2/2.
Optionally, you can derive your scaling values from simcraft (using simcraft is beyond the scope of this post) to get scaling values with your upgrades. To change your double upgrade to quadruple upgrade, just change upgrade=2 to upgrade=4 on any quadruple upgraded pieces in your simcraft profile. This even works with the 5.4.7-4 build of simc.
Mods: Please lock this thread once shadowcraft is updated. I'm only posting it to help the community in the interim.