Synergies was never balanced with Rejuvenation pots in mind, i asked Salan to remove them before, but for some reason he left them in, which makes it really easy compared to having a balanced character, he did remove the "Synergies Rejuvenation Potion" but seeing as the ultimate rejuv potion and the rest of them are still available to craft as many as you want, it did not change anything.
Also, the new rebalance of the Embermage hasn't really been tested a lot it seems, could be that Salan simply buffed it too much.
You seem to have a full set already fully enchanted and socketed, so obviously by that time, the difficulty will be way lower than when you started your progress from T0 to T1.
Did a fast test on my old Embermage with Brimstone set, and yea, it's really easy, but i think it is on par with how easy it is when you are fully geared as a Berserker and Warlock anyway, plus that Warlock and Berserker has better survivability than the Embermage.
Might be a bit easy to progress with Embermage now tho, haven't tested to see how much damage you can potentially do early on with Vendor uniques/T0 gear.