Value of BRF 4pc
The math for 4pc is pretty easy since I already have the worth of 1 Chi on my
PS/CB spreadsheet: At full value of 2 chi every 45 seconds, that's about +5.44% total healing. Pretty strong.
5.44% total healing is worth 5.44*110 = 598.4 "stat points", and if you're using the crit weight of 0.98 for below mana cap RJW, equivalent to 0.98*598.4 = 586.4 crit. This math is for maximum value, so for example if you're not using enough surging and only get 50% of the max value, then you multiply all these numbers by 0.50 (50%), which is still enough stats to potentially make up for dropping one item by 15 ilvls.
For example, if dropping from your heroic pants to normal tier pants costs you 100 “stat points” using the above stat weights, but it gets you your final tier piece for the 4pc, then you’d want to do that for almost every boss, because that’s an upgrade even if you only get a little bit of use out of the 4pc (>= 100/598.4 as a fraction of the 4pc usage would be an upgrade).