The dps checks on EX trials were always easy compared to raids.

A3 savage was horribly overtuned. Almost no one who cleared all of the coils fights before hand was beating it until people had almost all weekly lockout tome gear almost 2-3 months after the raid was out, was harder then A4 savage. It required high dps from everyone and a optimal setup to even stand a chance when it first came out.

Fight should be about the same difficulty as they have been in my opinion. With the A3 nightmare being left only for ultimate level fights for those wanting an insane challenge.

I do not think a savage tier fight should be designed with healers being required to max dps the whole time with optimal dps only melds and so on. I think they should have to dps, just should not require dps > heal to clear as a healer. If a group does min/max jobs or have a healer that is pushing massive dps that should simply cover a dps death in the fight or allow for the fight to be cleared earlier then intended. Aka if it was expected for you to be say Ilvl 455 doing this you could clear with a group avg of 451-452 with healers and tanks max dpsing. Aka give the group a buffer for failing mechanics or the ability to clear it 1-2 weeks faster then intended without needing tome upgrades. (Basically how it has been designed in the game not counting A3 savage)

Ultimate tier then I can see that requiring everyone to be optimal for the whole duration to clear, healers and tanks should be expected to maximize dps in this tier of fight while performing their other roles as well.