I've tried to convince myself I like the force-mystic 4pc bonus for our pve set, but I can't do it. No matter how I look at it, it's just not a very good bonus, so I've gone back and forth between using the 2pc PVP bonus but I can't decide which I like more. I want to state my reasoning and get some insight from other sage healers to see if I can finally pick one or the other.
An additional 50 force if you're running straight heals and not sacrificing to regen, amounts to one additional deliverance which in reality isn't that useful because if you're down to your last heal, your ability to regen force is very poor and you're usually exchanging health for force at that point anyway
It does however, give you an additional 4 force back when you do use sacrifice, which I think is why bioware kept the number low (and not say, 100). But thinking about how often I would sacrifice, if the fight is crazy I don't sacrifice whenever proc comes up because I might not have a spare GCD, but let's pretend I do since it makes number crunching easier, you can get a free sacrifice every 10 seconds or so assuming you use healing trance off CD and it crits (though I usually sacrifice anyway since it usually crits and I can't be bothered to look through 15 buffs to see if I have proc) Going off that, you'd get an extra 4 force every 10 seconds, 24 in a minute, 240 force back in a 10 minute fight.
That amounts to an extra 4 deliverance's, 5 if you count the extra one you get innately from having 50 extra force, which let's say you do a 4k heal with it, amounts to an extra 20k healing you can use throughout the fight. If you break it down by HP/S it's about 33.3 hp/s
Alternatively what I find myself using a lot, is my 2 pc pvp bonus, which reduces the exhaustion on force armor by 3 seconds (down to 17 from 20) which doesn't seem like much, but let's me keep more rolling shields on the tank going, and in any given boss fight in an operation, the tank is usually taking damage throughout the fight so very rarely will a shield go ununsed (except for movement phases possibly) so I'm going to pretend the shield will always absorb damage. I haven't done extensive testing on my shield but I think it absorbs around 4k damage. Going off that if I had rolling shields on a tank going over a 10 minute fight @ 20 seconds a piece I'd get an extra 5 shields off one single-target during that period of time, which is completely sustainable, plus you could potentially get a few more shields off on the off-tank or dps. However that's hard to calculate especially given force constraints, so for the sake of number crunching I'm going to just use the 5 you get off the main tank. At 4k absorbed, it amounts to 20k absorbed which is also 33.3 hp/s, exactly the same as the 4 pc pve bonus.
By the numbers they are about the same overall, but there are advantages to either side.
Going with the 4pc bonus does amount to a little bit better stats (remember we're only replacing two pve pieces with pvp pieces here) Which, will amount to somewhere between 5-10 hp/s depending on the healing spell you're currently casting. However I've never thought to myself "If only I had an extra 20 damaged healed off that deliverance" The force regen is very miniscule and I never notice, at the end of the day it seems like if I'm burning force I'll run out, or if I'm able to be conservative I can restore it.
Going with the 2pc pvp bonus, gets you a little more flexibility on healing, first off your other healer loves your shields, the longer it's up the less they have to do and shields are fantastic because they *never* result in overheals unless they go unused (again hard to do when the shield's on the tank you're far more likely to overheal with deliverance, either from you or from your other healers. And I have felt very glad, that occasionally my shield was up just a little bit sooner.
I'm not 100% sure on my numbers, but I'd like some insight to see what other healers think, if any have reached a similar conclusion to me or not.