What I am saying is over time 2 Perf shifters, an end mod in stamina, and the panacea proc equals more end than just the 3 end mods, all with the same number of slots. it would also mean a negligable but still there 7.5% movement speed buff for what that is worth if you use the end mod in perf shift for 2 piece set bonus.
I forgot to add, I believe Panacea is .75 end/sec. I think it is 150% of perf shifter but I might not be remembering that correct. I do know it is worth more than Perf shifter though.