The tooltip for the set "Unyielding Protector" says, that at 6 pieces of it - the set provides 25% Elemental Damage Reduction for teammates near you when you activate Force Barrier. But isn't Elemental Damage Reduciton supposed to come with Internal Damage Reduction as well, because Jedi Knight deals Elemental Damage with abilities, those mirror Sith Warrior's abilities, but with Internal Damage instead.

That would mean adding Elemental Damage Reduction, but not internal makes Sith Warriors better at PvP, because their DoT abilities' damage won't be reduced by that set. It's the same as why Kinetic & Energy Damage Reduction should come altogether, because Consulars deal Kinetic damage with abilities, those mirror Inquisitor's Energy damage abilities. Although there are couple adds those get "Energy Shield" power that reduces incoming Energy damage, but it's just a trash add power, for adds you clear along the way between bosses, so no need to balance it.

l can't test if the set actually priovides Internal Damage Reduction along with Elemental, because the set "Unyielding Protector" is not at Tech Fragments vendor. Is it even possible right now to obtain 6 pieces of that set at all? But in any case l think the tooltip should be changed to "Elemental and Internal Damage Reduction by 25%", and in case if it doesn't provide Internal reduction this should be add to it for balance purposes. This set seems to be designed mainly for PvP after all.