736 - No.... err Probably not actually. (You have 776, but as you pointed out, 736 without ArP gems)
Don't consider it until you switch away from Bryntroll. Short of heroic gear, it will be very hard to hit the ArP cap.
You have 23 gem slot, 1 for nightmare's gear gives you 22 not needed to activate your meta.
That's 22x20 = 440 ArP + 14x3 (JC) for a total of 440+42 = 482 ArP.
Your target is 1360 (hearty rhino will get you to 1400).
So to hit 1400 you have
1400 - 736 (passive) = 664 to make up.
482 < 664 so don't gem ArP. You have a difference of 182.
Check Landsouls, that's the best indicator (just import your character and switch all the gems to ArP and see what the DPS difference is)
But given you'd still be 182 from the cap (222 if you didn't eat Hearty Rhino) I think the answer is going to be no.