TL;DR
The Hist Bark and Spectre's Eye item sets would be more viable as back bar defensive options if their 2 piece bonuses to armor were swapped in order with their 4 piece bonuses to maximum health.
The sets, as they are currently on live:
Hist bark:
(2 items) Adds 1487 Armor
(3 items) Adds 1096 Maximum Stamina
(4 items) Adds 1206 Maximum Health
(5 items) While you are blocking you gain Major Evasion, reducing damage from area attacks by 20%.
Spectre's Eye:
(2 items) Adds 1487 Armor
(3 items) Adds 1096 Maximum Magicka
(4 items) Adds 1206 Maximum Health
(5 items) When you cast a Magicka Ability while in combat you gain Major Evasion for 30 seconds, reducing damage from area attacks by 20%. This effect can occur once every 30 seconds.
The sets, after the proposed change:
Hist bark:
(2 items) Adds 1206 Maximum Health
(3 items) Adds 1096 Maximum Stamina
(4 items) Adds 1487 Armor
(5 items) While you are blocking you gain Major Evasion, reducing damage from area attacks by 20%.
Spectre's Eye:
(2 items) Adds 1206 Maximum Health
(3 items) Adds 1096 Maximum Magicka
(4 items) Adds 1487 Armor
(5 items) When you cast a Magicka Ability while in combat you gain Major Evasion for 30 seconds, reducing damage from area attacks by 20%. This effect can occur once every 30 seconds.
The following post is in regards to these two item sets:
Hist bark:
(2 items) Adds 1487 Armor
(3 items) Adds 1096 Maximum Stamina
(4 items) Adds 1206 Maximum Health
(5 items) While you are blocking you gain Major Evasion, reducing damage from area attacks by 20%.
Spectre's Eye:
(2 items) Adds 1487 Armor
(3 items) Adds 1096 Maximum Magicka
(4 items) Adds 1206 Maximum Health
(5 items) When you cast a Magicka Ability while in combat you gain Major Evasion for 30 seconds, reducing damage from area attacks by 20%. This effect can occur once every 30 seconds.
I've always had my eye on both of these sets as potentially powerful back bar defensive sets on heavy and light armor builds in PvP. However, the same issue on both of these sets is holding me back from using them: the 4 item bonus to maximum health.
The only times I switch to my back bar (defensive bar) are the times when I'm under pressure and already taking damage. In these situations, gaining an extra bonus to maximum health is rendered useless because that portion of health is already missing by the time I switch bars.
Both of these sets suffer from this problem, and both could be remedied with the same very simple fix: if each of these sets' 2 piece bonuses (armor) were swapped in order with their 4 piece bonuses (maximum health), each of these sets would instantly become a lot more viable for back bar options, as the max health bonus would no longer feel wasted and the extra armor could continue to be used while under pressure.
The simple reordering of these sets' 2 and 4 piece bonuses would not alter the stats offered by both of these sets, and would provide a much needed quality of life improvement that allows better use of the maximum health bonus without devaluing the armor bonus. This simple change would only help to bring more use to these currently under-used sets and allow them to compete as viable back barred PvP sets.
If the change proposed above is adopted, this is what the sets would look like, changes in bold:
Hist bark:
(2 items) Adds 1206 Maximum Health
(3 items) Adds 1096 Maximum Stamina
(4 items) Adds 1487 Armor
(5 items) While you are blocking you gain Major Evasion, reducing damage from area attacks by 20%.
Spectre's Eye:
(2 items) Adds 1206 Maximum Health
(3 items) Adds 1096 Maximum Magicka
(4 items) Adds 1487 Armor
(5 items) When you cast a Magicka Ability while in combat you gain Major Evasion for 30 seconds, reducing damage from area attacks by 20%. This effect can occur once every 30 seconds.
This simple tweak would instantly make each of these sets a lot more attractive to me as back bar options, and I'm sure I'm not alone in this sentiment.