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Just in case anyone is wondering, upgrading the RPPM trinkets DOES increase the proc rate.

So by default they are:
* 0.525 RealPPM on damage/absorb from harmful spells and periodic spells.
* No ICD.
* Proc rate multiplied by 0.00 for non-caster specs.
* Proc rate multiplied by 0.65 for Balance Druids.
* Proc rate multiplied by 0.25 against player controlled units.
* Proc rate multiplied by 1/(1.15^((528-ItemLevel)/15) for the various Item Level versions of the trinket.

I worked out all of the various ilevels for the priest forum. You can work out balance and non caster for yourself!

502 ilevel = 78.49% proc multiplier, LFR, 0/2 Upgrade
506 ilevel = 81.47% proc multiplier, LFR, 1/2 Upgrade
510 ilevel = 84.56% proc multiplier, LFR, 2/2 Upgrade
522 ilevel = 94.56% proc multiplier, Normal, 0/2 Upgrade
526 ilevel = 98.15% proc multiplier, Normal, 1/2 Upgrade
528 ilevel = 100.00% proc multiplier, Normal Thunderforged, 0/2 Upgrade
530 ilevel = 101.88% proc multiplier, Normal, 2/2 Upgrade
532 ilevel = 103.80% proc multiplier, Normal Thunderforged, 1/2 Upgrade
535 ilevel = 106.74% proc multiplier, Heroic, 0/2 Upgrade
536 ilevel = 107.74% proc multiplier, Normal Thunderforged, 2/2 Upgrade
539 ilevel = 110.79% proc multiplier, Heroic, 1/2 Upgrade
541 ilevel = 112.88% proc multiplier, Heroic Thunderforged, 0/2 Upgrade
543 ilevel = 115.00% proc multiplier, Heroic, 2/2 Upgrade
545 ilevel = 117.16% proc multiplier, Heroic Thunderforged, 1/2 Upgrade
549 ilevel = 121.61% proc multiplier, Heroic Thunderforged, 2/2 Upgrade