Shadow provides 18.3% critical damage to abilities. The old warhorn acted as a 1.3 multiplier, so for as long as Major Force is up, you'd actually get 23.79% critical damage (or 5.49% less than previously).
best way to compare would be to consider your total critical damage instead. For the sake of simplicity, let's say Shadow provides 18%, minor force 12%, 10% from CPs and you're a NB / templar (so 10% extra crit). All of these would provide you with 50 (base) + 18 (Shadow) + 12 (Minor force, usually Rearming trap) + 10 (CPs) + 10 (temp / NB), for a total of 100% critical damage, so all your critical hits are doubled (no Major Force).
On live, you get 100 * 1.3 = 130% critical potency as long as Major Force is up (100% uptime). On PTS, you get 100 + 15 = 115% critical potency as long as Major Force is up (100% uptime).
In a more realistic situation (heavily dependent on group and warhorn rotations, here are your actual average crit potencies for 35 and 50% uptime:
On live with 35% uptime: (100 * 1.3 * 0.35) + 100 * ( 1 - 0.35 ) = 110.5% critical potency. On PTS with 35% uptime: (100 + 15 ) * 0.35 + 100 * ( 1 - 0.35 ) = 105.25% critical potency.
A 4.75% difference.
On live with 50% uptime: (100 * 1.3 * 0.5) + 100 * ( 1 - 0.5 ) = 115% critical potency. On PTS with 50% uptime: (100 + 15 ) * 0.5 + 100 * ( 1 - 0.5 ) = 107.5% critical potency.
A 7.5% difference.
Those results are then multiplicative with your critical chance.
Supposing all events being even, you'd have for a few critical chance values (assuming same setup otherwise):
Live / 35% uptime / 50% critical chance: 55.25% DPS increase from critical hits Live / 35% uptime / 70% critical chance: 77.35% DPS increase from critical hits Live / 35% uptime / 80% critical chance: 88.4% DPS increase from critical hits
Interesting point: the lower your crit damage, the lower the difference between PTS and live. Some builds (mag sorc for instance) don't run minor force and don't have a passive 10% crit bonus.*
* NB: those calculations are still considered with 18% from Shadow, not 18.3%, altho the difference is insignificant.
Edited by Asmael on January 12, 2017 2:54PM
PC EU - Zahraji of the Void, aka "Kitty", the fluffiest salmon genocider in town.
Poke @AsmaeI (last letter is uppercase "i") on PC EU or Asmael#9325 on Discord and receive a meow today.
Not the best Idea, since Hunding's give more Weaponpower than Warrior Mundus stone.
Which is a little bit crazy when you think about.
It would be nice if development did a pass through mundus stones and re-balanced them a touch at some point.